{"id":1487,"date":"2026-09-29T00:47:31","date_gmt":"2026-09-29T00:47:31","guid":{"rendered":"https:\/\/samgomold.com\/?p=1487"},"modified":"2026-09-29T01:35:49","modified_gmt":"2026-09-29T01:35:49","slug":"cnc-plastic-prototypes-vs-injection-molded-parts-key-differences-engineers-should-understand","status":"publish","type":"post","link":"https:\/\/samgomold.com\/fr\/cnc-plastic-prototypes-vs-injection-molded-parts-key-differences-engineers-should-understand\/","title":{"rendered":"CNC Plastic Prototypes vs. Injection Molded Parts: Key Differences Engineers Should Understand"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"1487\" class=\"elementor elementor-1487\" data-elementor-post-type=\"post\">\n\t\t\t\t<div class=\"elementor-element elementor-element-723cb8a e-flex e-con-boxed e-con e-parent\" data-id=\"723cb8a\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-9a0b881 elementor-widget elementor-widget-image\" data-id=\"9a0b881\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img fetchpriority=\"high\" decoding=\"async\" width=\"800\" height=\"379\" src=\"https:\/\/samgomold.com\/wp-content\/uploads\/2026\/09\/87c48d0e-fea8-45cc-a4cf-e0d006dae247-1024x485.png\" class=\"elementor-animation-bob attachment-large size-large wp-image-1490\" alt=\"\" srcset=\"https:\/\/samgomold.com\/wp-content\/uploads\/2026\/09\/87c48d0e-fea8-45cc-a4cf-e0d006dae247-1024x485.png 1024w, https:\/\/samgomold.com\/wp-content\/uploads\/2026\/09\/87c48d0e-fea8-45cc-a4cf-e0d006dae247-300x142.png 300w, https:\/\/samgomold.com\/wp-content\/uploads\/2026\/09\/87c48d0e-fea8-45cc-a4cf-e0d006dae247-768x364.png 768w, https:\/\/samgomold.com\/wp-content\/uploads\/2026\/09\/87c48d0e-fea8-45cc-a4cf-e0d006dae247-1536x728.png 1536w, https:\/\/samgomold.com\/wp-content\/uploads\/2026\/09\/87c48d0e-fea8-45cc-a4cf-e0d006dae247-18x9.png 18w, https:\/\/samgomold.com\/wp-content\/uploads\/2026\/09\/87c48d0e-fea8-45cc-a4cf-e0d006dae247.png 1822w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-1687781 e-flex e-con-boxed e-con e-parent\" data-id=\"1687781\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-de75045 elementor-toc--minimized-on-tablet elementor-widget elementor-widget-table-of-contents\" data-id=\"de75045\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;headings_by_tags&quot;:[&quot;h1&quot;,&quot;h2&quot;],&quot;exclude_headings_by_selector&quot;:[],&quot;marker_view&quot;:&quot;bullets&quot;,&quot;no_headings_message&quot;:&quot;No headings were found on this page.&quot;,&quot;icon&quot;:{&quot;value&quot;:&quot;fas fa-circle&quot;,&quot;library&quot;:&quot;fa-solid&quot;,&quot;rendered_tag&quot;:&quot;&lt;svg class=\\&quot;e-font-icon-svg e-fas-circle\\&quot; viewBox=\\&quot;0 0 512 512\\&quot; xmlns=\\&quot;http:\\\/\\\/www.w3.org\\\/2000\\\/svg\\&quot;&gt;&lt;path d=\\&quot;M256 8C119 8 8 119 8 256s111 248 248 248 248-111 248-248S393 8 256 8z\\&quot;&gt;&lt;\\\/path&gt;&lt;\\\/svg&gt;&quot;},&quot;minimize_box&quot;:&quot;yes&quot;,&quot;minimized_on&quot;:&quot;tablet&quot;,&quot;hierarchical_view&quot;:&quot;yes&quot;,&quot;min_height&quot;:{&quot;unit&quot;:&quot;px&quot;,&quot;size&quot;:&quot;&quot;,&quot;sizes&quot;:[]},&quot;min_height_tablet&quot;:{&quot;unit&quot;:&quot;px&quot;,&quot;size&quot;:&quot;&quot;,&quot;sizes&quot;:[]},&quot;min_height_mobile&quot;:{&quot;unit&quot;:&quot;px&quot;,&quot;size&quot;:&quot;&quot;,&quot;sizes&quot;:[]}}\" data-widget_type=\"table-of-contents.default\">\n\t\t\t\t\t\t\t\t\t<div class=\"elementor-toc__header\">\n\t\t\t\t\t\t<h4 class=\"elementor-toc__header-title\">\n\t\t\t\tTable of Contents\t\t\t<\/h4>\n\t\t\t\t\t\t\t\t\t\t<div class=\"elementor-toc__toggle-button elementor-toc__toggle-button--expand\" role=\"button\" tabindex=\"0\" aria-controls=\"elementor-toc__de75045\" aria-expanded=\"true\" aria-label=\"Open table of contents\"><svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-chevron-down\" viewBox=\"0 0 448 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M207.029 381.476L12.686 187.132c-9.373-9.373-9.373-24.569 0-33.941l22.667-22.667c9.357-9.357 24.522-9.375 33.901-.04L224 284.505l154.745-154.021c9.379-9.335 24.544-9.317 33.901.04l22.667 22.667c9.373 9.373 9.373 24.569 0 33.941L240.971 381.476c-9.373 9.372-24.569 9.372-33.942 0z\"><\/path><\/svg><\/div>\n\t\t\t\t<div class=\"elementor-toc__toggle-button elementor-toc__toggle-button--collapse\" role=\"button\" tabindex=\"0\" aria-controls=\"elementor-toc__de75045\" aria-expanded=\"true\" aria-label=\"Close table of contents\"><svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-chevron-up\" viewBox=\"0 0 448 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M240.971 130.524l194.343 194.343c9.373 9.373 9.373 24.569 0 33.941l-22.667 22.667c-9.357 9.357-24.522 9.375-33.901.04L224 227.495 69.255 381.516c-9.379 9.335-24.544 9.317-33.901-.04l-22.667-22.667c-9.373-9.373-9.373-24.569 0-33.941L207.03 130.525c9.372-9.373 24.568-9.373 33.941-.001z\"><\/path><\/svg><\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<div id=\"elementor-toc__de75045\" class=\"elementor-toc__body\">\n\t\t\t<div class=\"elementor-toc__spinner-container\">\n\t\t\t\t<svg class=\"elementor-toc__spinner eicon-animation-spin e-font-icon-svg e-eicon-loading\" aria-hidden=\"true\" viewBox=\"0 0 1000 1000\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M500 975V858C696 858 858 696 858 500S696 142 500 142 142 304 142 500H25C25 237 238 25 500 25S975 237 975 500 763 975 500 975Z\"><\/path><\/svg>\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-e3a4c91 e-flex e-con-boxed e-con e-parent\" data-id=\"e3a4c91\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-f38d483 elementor-widget elementor-widget-text-editor\" data-id=\"f38d483\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<h2>Introduction<\/h2><p>CNC machining is widely used to manufacture functional plastic<a href=\"https:\/\/samgomold.com\/en\/prototype\/\" target=\"_blank\" rel=\"noopener\"><span style=\"color: #3366ff;\"> prototypes<\/span><\/a> before an injection mold is built. A CNC prototype can help engineers evaluate product dimensions, assembly, appearance and basic mechanical performance without investing in <a href=\"https:\/\/samgomold.com\/en\/molds\/\" target=\"_blank\" rel=\"noopener\"><span style=\"color: #3366ff;\">production tooling.<\/span><\/a><\/p><p>However, a CNC-machined prototype is <strong>not an exact representation of a future injection molded part<\/strong>.<\/p><p>Even when both parts are described as ABS, PC, PA or another engineering plastic, differences in raw material form, manufacturing process, internal stress, geometry, surface condition and dimensional behavior can produce significantly different results.<\/p><p>Understanding these differences is particularly important during product development. If CNC prototype results are interpreted incorrectly, engineers may approve a design that later creates problems during injection molding\u2014or reject a design because of a prototype issue that would not occur in production.<\/p><p>This article explains the practical engineering differences between CNC plastic prototypes and injection molded parts and how manufacturers should use CNC prototypes correctly before tooling.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-69bab3c e-con e-atomic-element e-flexbox-base e-default-div e-8c704e0 \" data-id=\"69bab3c\" data-element_type=\"e-flexbox\" data-e-type=\"e-flexbox\" data-interaction-id=\"69bab3c\" data-e-type=\"e-flexbox\" data-id=\"69bab3c\">\n    <div class=\"elementor-element elementor-element-3cb1909 e-con e-atomic-element e-flexbox-base e-default-div e-7641df6 \" data-id=\"3cb1909\" data-element_type=\"e-flexbox\" data-e-type=\"e-flexbox\" data-interaction-id=\"3cb1909\" data-e-type=\"e-flexbox\" data-id=\"3cb1909\">\n    \t\t<div class=\"elementor-element elementor-element-e8235c1 elementor-widget elementor-widget-text-editor\" data-id=\"e8235c1\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<h2>1. The Manufacturing Principle Is Fundamentally Different<\/h2><p>The most important difference is how the part is created.<\/p><p>CNC machining is a <strong>subtractive manufacturing process<\/strong>. A plastic sheet, plate, rod or block is clamped in a machining center, and cutting tools remove material until the required geometry remains.<\/p><p>Injection molding works differently. Plastic pellets are melted, injected into a closed mold cavity under pressure, packed, cooled and then ejected.<\/p><p>Because one process removes material from a solid stock and the other forms a component from molten polymer, the finished parts do not necessarily have identical physical behavior.<\/p><div><div><div><table><thead><tr><th>Comparison<\/th><th>CNC Plastic Prototype<\/th><th>Injection Molded Part<\/th><\/tr><\/thead><tbody><tr><td>Manufacturing principle<\/td><td>Material removal<\/td><td>Melt, injection, packing and cooling<\/td><\/tr><tr><td>Initial investment<\/td><td>Low<\/td><td>High due to mold tooling<\/td><\/tr><tr><td>Unit cost<\/td><td>Relatively high<\/td><td>Low at production volume<\/td><\/tr><tr><td>Lead time for first parts<\/td><td>Short<\/td><td>Requires mold manufacturing<\/td><\/tr><tr><td>Design changes<\/td><td>Relatively easy<\/td><td>May require mold modification<\/td><\/tr><tr><td>Typical quantity<\/td><td>1\u2013100+ parts<\/td><td>Hundreds to millions<\/td><\/tr><tr><td>Main purpose<\/td><td>Prototype and validation<\/td><td>Production<\/td><\/tr><\/tbody><\/table><\/div><\/div><\/div><p>This fundamental process difference explains many of the dimensional and mechanical differences discussed below.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\n<\/div>\n<div class=\"elementor-element elementor-element-56587c3 e-con e-atomic-element e-flexbox-base e-default-div e-66d0708 \" data-id=\"56587c3\" data-element_type=\"e-flexbox\" data-e-type=\"e-flexbox\" data-interaction-id=\"56587c3\" data-e-type=\"e-flexbox\" data-id=\"56587c3\">\n    \t\t\t<img decoding=\"async\" class=\"e-image-base e-default-img \" data-interaction-id=\"fae3cc2\" data-e-type=\"widget\" data-id=\"fae3cc2\" id=\"1492\" src=\"https:\/\/samgomold.com\/wp-content\/uploads\/2026\/09\/2.png\" width=\"1448\" height=\"1086\" srcset=\"https:\/\/samgomold.com\/wp-content\/uploads\/2026\/09\/2.png 1448w, https:\/\/samgomold.com\/wp-content\/uploads\/2026\/09\/2-300x225.png 300w, https:\/\/samgomold.com\/wp-content\/uploads\/2026\/09\/2-1024x768.png 1024w, https:\/\/samgomold.com\/wp-content\/uploads\/2026\/09\/2-768x576.png 768w, https:\/\/samgomold.com\/wp-content\/uploads\/2026\/09\/2-16x12.png 16w\" alt=\"\"\/>\t\t\n<\/div>\n\n<\/div>\n<div class=\"elementor-element elementor-element-e67a808 e-con e-atomic-element e-flexbox-base e-default-div e-6dc2eab \" data-id=\"e67a808\" data-element_type=\"e-flexbox\" data-e-type=\"e-flexbox\" data-interaction-id=\"e67a808\" data-e-type=\"e-flexbox\" data-id=\"e67a808\">\n    <div class=\"elementor-element elementor-element-69d8abc e-con e-atomic-element e-flexbox-base e-default-div e-fe41bee \" data-id=\"69d8abc\" data-element_type=\"e-flexbox\" data-e-type=\"e-flexbox\" data-interaction-id=\"69d8abc\" data-e-type=\"e-flexbox\" data-id=\"69d8abc\">\n    \t\t\t<img decoding=\"async\" class=\"e-image-base e-default-img \" data-interaction-id=\"b6aec04\" data-e-type=\"widget\" data-id=\"b6aec04\" id=\"1493\" src=\"https:\/\/samgomold.com\/wp-content\/uploads\/2026\/09\/3.png\" width=\"1448\" height=\"1086\" srcset=\"https:\/\/samgomold.com\/wp-content\/uploads\/2026\/09\/3.png 1448w, https:\/\/samgomold.com\/wp-content\/uploads\/2026\/09\/3-300x225.png 300w, https:\/\/samgomold.com\/wp-content\/uploads\/2026\/09\/3-1024x768.png 1024w, https:\/\/samgomold.com\/wp-content\/uploads\/2026\/09\/3-768x576.png 768w, https:\/\/samgomold.com\/wp-content\/uploads\/2026\/09\/3-16x12.png 16w\" alt=\"\"\/>\t\t\n<\/div>\n<div class=\"elementor-element elementor-element-af764a7 e-con e-atomic-element e-flexbox-base e-default-div e-eb6cbd7 \" data-id=\"af764a7\" data-element_type=\"e-flexbox\" data-e-type=\"e-flexbox\" data-interaction-id=\"af764a7\" data-e-type=\"e-flexbox\" data-id=\"af764a7\">\n    \t\t<div class=\"elementor-element elementor-element-15d52fd elementor-widget elementor-widget-text-editor\" data-id=\"15d52fd\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<h2>2. \u201cThe Same Material\u201d May Not Mean the Same Material Performance<\/h2><p>A common misunderstanding occurs when a CNC prototype and an injection molded component are both specified as <strong>PC<\/strong>, <strong>ABS<\/strong> or <strong>PA66<\/strong>.<\/p><p>The material family may be the same, but the actual grade and material history can be different.<\/p><p>CNC prototypes are normally machined from commercially available plastic stock. Injection molded parts are produced from molding-grade pellets selected according to flow, impact strength, flame retardancy, UV resistance, reinforcement and other requirements.<\/p><p>Therefore:<\/p><p><strong>CNC PC \u2260 automatically the same performance as injection-grade PC.<\/strong><\/p><p>This becomes even more important with modified engineering plastics such as:<\/p><ul><li>PC+ABS<\/li><li>PA6+GF30%<\/li><li>PA66+GF30%<\/li><li>PA6+CF20%<\/li><li>Flame-retardant PC<\/li><li>UV-stabilized materials<\/li><li>Impact-modified PP<\/li><\/ul><p>When functional testing is critical, engineers should confirm whether the prototype material is sufficiently representative of the intended production resin.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\n<\/div>\n\n<\/div>\n<div class=\"elementor-element elementor-element-80b42c2 e-flex e-con-boxed e-con e-parent\" data-id=\"80b42c2\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-d97cb31 elementor-widget elementor-widget-text-editor\" data-id=\"d97cb31\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<h2>3. CNC Parts Do Not Reproduce Injection Molding Shrinkage<\/h2><p>CNC prototypes are machined directly to dimensions from solid stock. They do not experience the same melt-to-solid shrinkage cycle as injection molded components.<\/p><p>Injection molded parts undergo:<\/p><p><strong>melting \u2192 cavity filling \u2192 packing \u2192 cooling \u2192 shrinkage \u2192 ejection \u2192 post-molding dimensional stabilization<\/strong><\/p><p>As a result, production parts can exhibit dimensional behavior that cannot be fully predicted from a CNC prototype.<\/p><p>For example, a 200 mm CNC housing may be machined very close to its CAD dimensions. A 200 mm injection molded housing, however, must account for material shrinkage, mold temperature, packing pressure, cooling conditions and geometry.<\/p><p>This means CNC prototypes are excellent for checking <strong>nominal assembly dimensions<\/strong>, but they cannot directly validate the actual molding shrinkage of a production part.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-c9b6ce8 e-flex e-con-boxed e-con e-parent\" data-id=\"c9b6ce8\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-a770c91 elementor-widget elementor-widget-image\" data-id=\"a770c91\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"1448\" height=\"1086\" src=\"https:\/\/samgomold.com\/wp-content\/uploads\/2026\/09\/4.png\" class=\"attachment-1536x1536 size-1536x1536 wp-image-1494\" alt=\"\" srcset=\"https:\/\/samgomold.com\/wp-content\/uploads\/2026\/09\/4.png 1448w, https:\/\/samgomold.com\/wp-content\/uploads\/2026\/09\/4-300x225.png 300w, https:\/\/samgomold.com\/wp-content\/uploads\/2026\/09\/4-1024x768.png 1024w, https:\/\/samgomold.com\/wp-content\/uploads\/2026\/09\/4-768x576.png 768w, https:\/\/samgomold.com\/wp-content\/uploads\/2026\/09\/4-16x12.png 16w\" sizes=\"(max-width: 1448px) 100vw, 1448px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-ae11663 e-flex e-con-boxed e-con e-parent\" data-id=\"ae11663\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-f28d598 elementor-widget elementor-widget-text-editor\" data-id=\"f28d598\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<h2>4. Warpage Behavior Can Be Completely Different<\/h2><p>This is one of the most important differences when moving from prototype to mass production.<\/p><p>A CNC component is cut from a solid block. An injection molded component is formed through flowing molten polymer followed by non-uniform cooling.<\/p><p>The injection molding process introduces variables such as:<\/p><ul><li>Melt-flow direction<\/li><li>Gate location<\/li><li>Packing-pressure distribution<\/li><li>Cooling differences<\/li><li>Fiber orientation<\/li><li>Wall-thickness variation<\/li><li>Residual stress<\/li><\/ul><p>These factors can create warpage even when the CNC prototype remains flat.<\/p><p>For example, a large flat enclosure might perform perfectly during CNC prototype assembly. After injection molding, the same design could show corner lifting or twisting because different areas of the component cool and shrink differently.<\/p><p>Therefore, <strong>a flat CNC prototype does not guarantee a flat injection molded production part<\/strong>.<\/p><h2>5. Mechanical Properties Can Also Be Different<\/h2><p>CNC prototypes are often used for functional testing, but test results must be interpreted carefully.<\/p><p>For unfilled engineering plastics, CNC prototypes can provide useful information about stiffness, impact resistance and assembly performance. However, their mechanical behavior may still differ from molded parts because of differences in material grade and manufacturing history.<\/p><p>The difference becomes more significant for fiber-reinforced materials.<\/p><p>During injection molding, glass or carbon fibers tend to orient according to melt flow. This can make mechanical properties directional.<\/p><p>A CNC-machined sample cut from reinforced stock may have a different reinforcement orientation from a molded production component.<\/p><div><div><div><table><thead><tr><th>Test<\/th><th>CNC Prototype Reliability for Predicting Molded Part<\/th><\/tr><\/thead><tbody><tr><td>Basic assembly<\/td><td>Excellent<\/td><\/tr><tr><td>Product size\/ergonomics<\/td><td>Excellent<\/td><\/tr><tr><td>Component interference<\/td><td>Excellent<\/td><\/tr><tr><td>Basic structural concept<\/td><td>Good<\/td><\/tr><tr><td>Snap-fit behavior<\/td><td>Moderate to good<\/td><\/tr><tr><td>Exact impact performance<\/td><td>Requires caution<\/td><\/tr><tr><td>Molded shrinkage<\/td><td>Poor<\/td><\/tr><tr><td>Mold-flow-related warpage<\/td><td>Poor<\/td><\/tr><tr><td>Weld-line strength<\/td><td>Cannot be properly validated<\/td><\/tr><tr><td>Gate-related appearance<\/td><td>Cannot be validated<\/td><\/tr><\/tbody><\/table><\/div><\/div><\/div><p>The prototype should therefore be used to answer the correct engineering questions.<\/p><hr \/><h2>6. Some CNC Geometry Cannot Be Directly Transferred to Injection Molding<\/h2><p>A CNC prototype can sometimes contain geometry that is easy to machine but unsuitable for injection molding.<\/p><p>For example, a CNC-machined housing may have nearly vertical walls without draft.<\/p><p>An injection molded housing normally requires appropriate draft to allow reliable ejection from the mold.<\/p><p>Likewise, CNC machining and injection molding have different geometric constraints.<\/p><h3>CNC-specific considerations<\/h3><p>CNC cutting tools have physical diameters. Internal corners therefore normally contain machining radii rather than perfectly sharp corners.<\/p><p>Deep narrow pockets can also become difficult to machine because of tool reach and vibration.<\/p><h3>Injection-molding considerations<\/h3><p>Injection molded components must consider:<\/p><ul><li>Draft angle<\/li><li>Uniform wall thickness<\/li><li>Undercuts<\/li><li>Parting lines<\/li><li>Gate location<\/li><li>Ejector locations<\/li><li>Ribs and bosses<\/li><li>Sink marks<\/li><li>Mold filling<\/li><li>Cooling<\/li><\/ul><p>A successful CNC prototype therefore does not automatically mean the CAD model is ready for mold manufacturing.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-4c760f0 e-flex e-con-boxed e-con e-parent\" data-id=\"4c760f0\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-699f926 elementor-widget elementor-widget-image\" data-id=\"699f926\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"1448\" height=\"1086\" src=\"https:\/\/samgomold.com\/wp-content\/uploads\/2026\/09\/5.png\" class=\"attachment-1536x1536 size-1536x1536 wp-image-1495\" alt=\"\" srcset=\"https:\/\/samgomold.com\/wp-content\/uploads\/2026\/09\/5.png 1448w, https:\/\/samgomold.com\/wp-content\/uploads\/2026\/09\/5-300x225.png 300w, https:\/\/samgomold.com\/wp-content\/uploads\/2026\/09\/5-1024x768.png 1024w, https:\/\/samgomold.com\/wp-content\/uploads\/2026\/09\/5-768x576.png 768w, https:\/\/samgomold.com\/wp-content\/uploads\/2026\/09\/5-16x12.png 16w\" sizes=\"(max-width: 1448px) 100vw, 1448px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-47cb3eb e-flex e-con-boxed e-con e-parent\" data-id=\"47cb3eb\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-3aaffeb elementor-widget elementor-widget-text-editor\" data-id=\"3aaffeb\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<h2>9. Cost Behavior Changes Dramatically with Quantity<\/h2><p>CNC machining avoids the initial cost of an injection mold, making it attractive for prototypes and low-volume requirements.<\/p><p>However, every CNC component consumes machine time, cutting tools and operator resources.<\/p><p>Injection molding requires a much larger initial tooling investment, but once the mold is validated, cycle times can be measured in seconds or minutes rather than hours of machining.<\/p><p>A simplified comparison looks like this:<\/p><div><div><div><table><thead><tr><th>Project Requirement<\/th><th>CNC Machining<\/th><th>Injection Molding<\/th><\/tr><\/thead><tbody><tr><td>1\u201310 prototype parts<\/td><td>Highly suitable<\/td><td>Usually uneconomical<\/td><\/tr><tr><td>20\u2013100 parts<\/td><td>Often suitable<\/td><td>Depends on project<\/td><\/tr><tr><td>Design still changing<\/td><td>Highly suitable<\/td><td>High tooling risk<\/td><\/tr><tr><td>Thousands of parts<\/td><td>Expensive per part<\/td><td>Usually more economical<\/td><\/tr><tr><td>Complex molded texture<\/td><td>Limited representation<\/td><td>Highly suitable<\/td><\/tr><tr><td>Production consistency<\/td><td>Limited by machining process<\/td><td>Excellent with stable tooling\/process<\/td><\/tr><\/tbody><\/table><\/div><\/div><\/div><p>The crossover quantity depends heavily on part size, complexity, material, mold specification and machining time, so there is no universal production quantity at which injection molding always becomes cheaper.<\/p><hr \/><h2>10. CNC Prototype Approval Should Not Be the Final Mold Approval<\/h2><p>A useful product-development workflow separates <strong>prototype validation<\/strong> from <strong>moldability validation<\/strong>.<\/p><p>A practical sequence is:<\/p><p><strong>CAD Design \u2192 CNC Prototype \u2192 Assembly Test \u2192 Design Revision \u2192 DFM \u2192 <a href=\"https:\/\/samgomold.com\/en\/injection-mold-flow-analysis-a-complete-guide-to-moldflow-simulation-for-plastic-parts\/\" target=\"_blank\" rel=\"noopener\"><span style=\"color: #3366ff;\">Moldflow<\/span><\/a> if required \u2192 Mold Design \u2192 <a href=\"https:\/\/samgomold.com\/en\/molds\/\" target=\"_blank\" rel=\"noopener\"><span style=\"color: #3366ff;\">Tool Manufacturing<\/span><\/a> \u2192 T0\/T1 Trial \u2192 Dimensional Inspection \u2192 Production Validation<\/strong><\/p><p>CNC testing answers:<\/p><blockquote><p>Does the product design work?<\/p><\/blockquote><p>DFM and mold engineering answer:<\/p><blockquote><p>Can this design be manufactured reliably by injection molding?<\/p><\/blockquote><p>T0\/T1 trials finally answer:<\/p><blockquote><p>Does the actual mold and molding process produce parts that meet the specification?<\/p><\/blockquote><p>These are different engineering questions and should not be treated as interchangeable approval stages.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-653c5ca e-flex e-con-boxed e-con e-parent\" data-id=\"653c5ca\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-923c809 elementor-widget elementor-widget-image\" data-id=\"923c809\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"800\" height=\"600\" src=\"https:\/\/samgomold.com\/wp-content\/uploads\/2026\/09\/6-1024x768.png\" class=\"attachment-large size-large wp-image-1496\" alt=\"\" srcset=\"https:\/\/samgomold.com\/wp-content\/uploads\/2026\/09\/6-1024x768.png 1024w, https:\/\/samgomold.com\/wp-content\/uploads\/2026\/09\/6-300x225.png 300w, https:\/\/samgomold.com\/wp-content\/uploads\/2026\/09\/6-768x576.png 768w, https:\/\/samgomold.com\/wp-content\/uploads\/2026\/09\/6-16x12.png 16w, https:\/\/samgomold.com\/wp-content\/uploads\/2026\/09\/6.png 1448w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-b9f1dd9 e-flex e-con-boxed e-con e-parent\" data-id=\"b9f1dd9\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-ecb465f elementor-widget elementor-widget-text-editor\" data-id=\"ecb465f\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<h1>Conclusion<\/h1><p>CNC plastic prototypes and injection molded parts may appear nearly identical, but they are manufactured through fundamentally different processes.<\/p><p>CNC machining is particularly effective for quickly validating dimensions, assembly relationships, ergonomics and basic functionality before tooling investment. However, it cannot completely reproduce injection-molding characteristics such as shrinkage, flow-induced fiber orientation, weld lines, gate marks, differential cooling, sink marks or molding-related warpage.<\/p><p>For this reason, CNC prototypes should not be viewed as miniature production runs. They are an <strong>engineering validation tool<\/strong> used to reduce uncertainty before mold manufacturing.<\/p><p>The most effective development strategy is to use CNC prototypes to identify product-design problems early, then perform DFM and mold engineering to convert the validated concept into an injection-moldable design.<\/p><p>When prototype testing and production validation are treated as separate stages, manufacturers can reduce mold modifications, shorten development cycles and achieve more predictable mass-production results.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-b842999 e-flex e-con-boxed e-con e-parent\" data-id=\"b842999\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-36d9009 elementor-widget elementor-widget-text-editor\" data-id=\"36d9009\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<h3 style=\"text-align: center;\"><span style=\"color: #3366ff;\">Get the latest price? We will reply as soon as possible (within 12 hours)<\/span><\/h3>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-e7f439b e-flex e-con-boxed e-con e-parent\" data-id=\"e7f439b\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-4bb403a elementor-widget elementor-widget-wpforms\" data-id=\"4bb403a\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"wpforms.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<div class=\"wpforms-container wpforms-container-full wpforms-render-modern\" id=\"wpforms-162\"><form id=\"wpforms-form-162\" class=\"wpforms-validate wpforms-form wpforms-ajax-form\" data-formid=\"162\" method=\"post\" enctype=\"multipart\/form-data\" action=\"\/fr\/wp-json\/wp\/v2\/posts\/1487\" data-token=\"fb7a1f77deefde2bd26410bea7ce31a5\" data-token-time=\"1790723555\"><noscript class=\"wpforms-error-noscript\">Veuillez activer JavaScript dans votre navigateur pour remplir ce formulaire.<\/noscript><div id=\"wpforms-error-noscript\" style=\"display: none;\">Veuillez activer JavaScript dans votre navigateur pour remplir ce formulaire.<\/div><div class=\"wpforms-field-container\"><div id=\"wpforms-162-field_1-container\" class=\"wpforms-field wpforms-field-name\" data-field-id=\"1\"><label class=\"wpforms-field-label\" for=\"wpforms-162-field_1\">Please enter your name <span class=\"wpforms-required-label\" aria-hidden=\"true\">*<\/span><\/label><input type=\"text\" id=\"wpforms-162-field_1\" class=\"wpforms-field-medium wpforms-field-required\" name=\"wpforms[fields][1]\" aria-errormessage=\"wpforms-162-field_1-error\" required><\/div>\t\t<div id=\"wpforms-162-field_4-container\"\n\t\t\tclass=\"wpforms-field wpforms-field-text\"\n\t\t\tdata-field-type=\"text\"\n\t\t\tdata-field-id=\"4\"\n\t\t\t>\n\t\t\t<label class=\"wpforms-field-label\" for=\"wpforms-162-field_4\" >or email enter<\/label>\n\t\t\t<input type=\"text\" id=\"wpforms-162-field_4\" class=\"wpforms-field-medium\" name=\"wpforms[fields][4]\" >\n\t\t<\/div>\n\t\t<div id=\"wpforms-162-field_2-container\" class=\"wpforms-field wpforms-field-email\" data-field-id=\"2\"><label class=\"wpforms-field-label\" for=\"wpforms-162-field_2\">Please enter your email <span class=\"wpforms-required-label\" aria-hidden=\"true\">*<\/span><\/label><input type=\"email\" id=\"wpforms-162-field_2\" class=\"wpforms-field-medium wpforms-field-required\" name=\"wpforms[fields][2]\" spellcheck=\"false\" aria-errormessage=\"wpforms-162-field_2-error\" required><\/div><div id=\"wpforms-162-field_3-container\" class=\"wpforms-field wpforms-field-textarea\" data-field-id=\"3\"><label class=\"wpforms-field-label\" for=\"wpforms-162-field_3\">Message or comment <span class=\"wpforms-required-label\" aria-hidden=\"true\">*<\/span><\/label><textarea id=\"wpforms-162-field_3\" class=\"wpforms-field-medium wpforms-field-required\" name=\"wpforms[fields][3]\" aria-errormessage=\"wpforms-162-field_3-error\" required><\/textarea><\/div><script>\n\t\t\t\t( function() {\n\t\t\t\t\tconst style = document.createElement( 'style' );\n\t\t\t\t\tstyle.appendChild( document.createTextNode( '#wpforms-162-field_4-container { position: absolute !important; overflow: hidden !important; display: inline !important; height: 1px !important; width: 1px !important; z-index: -1000 !important; padding: 0 !important; } #wpforms-162-field_4-container input { visibility: hidden; } #wpforms-conversational-form-page #wpforms-162-field_4-container label { counter-increment: none; }' ) );\n\t\t\t\t\tdocument.head.appendChild( style );\n\t\t\t\t\tdocument.currentScript?.remove();\n\t\t\t\t} )();\n\t\t\t<\/script><\/div><!-- .wpforms-field-container --><div class=\"wpforms-submit-container\" ><input type=\"hidden\" name=\"wpforms[id]\" value=\"162\"><input type=\"hidden\" name=\"wpforms[time_token]\" value=\"1790723555.4c658b7a1e578102298fd952df6e4bedd36f9d80f49c5537a3e0a91e86589800\"><input type=\"hidden\" name=\"page_title\" value=\"\"><input type=\"hidden\" name=\"page_url\" value=\"https:\/\/samgomold.com\/fr\/wp-json\/wp\/v2\/posts\/1487\"><input type=\"hidden\" name=\"url_referer\" value=\"\"><button type=\"submit\" name=\"wpforms[submit]\" id=\"wpforms-submit-162\" class=\"wpforms-submit\" data-alt-text=\"Sending...\" data-submit-text=\"Send an inquiry\" aria-live=\"assertive\" value=\"wpforms-submit\">Send an inquiry<\/button><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/samgomold.com\/wp-content\/plugins\/wpforms-lite\/assets\/images\/submit-spin.svg\" class=\"wpforms-submit-spinner\" style=\"display: none;\" width=\"26\" height=\"26\" alt=\"Chargement en cours\"><\/div><\/form><\/div>  <!-- .wpforms-container -->\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-e55f148 e-flex e-con-boxed e-con e-parent\" data-id=\"e55f148\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-0a61838 elementor-grid-4 elementor-grid-tablet-2 elementor-grid-mobile-1 elementor-posts--thumbnail-top elementor-widget elementor-widget-posts\" data-id=\"0a61838\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;classic_columns&quot;:&quot;4&quot;,&quot;classic_columns_tablet&quot;:&quot;2&quot;,&quot;classic_columns_mobile&quot;:&quot;1&quot;,&quot;classic_row_gap&quot;:{&quot;unit&quot;:&quot;px&quot;,&quot;size&quot;:35,&quot;sizes&quot;:[]},&quot;classic_row_gap_tablet&quot;:{&quot;unit&quot;:&quot;px&quot;,&quot;size&quot;:&quot;&quot;,&quot;sizes&quot;:[]},&quot;classic_row_gap_mobile&quot;:{&quot;unit&quot;:&quot;px&quot;,&quot;size&quot;:&quot;&quot;,&quot;sizes&quot;:[]}}\" data-widget_type=\"posts.classic\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-posts-container elementor-posts elementor-posts--skin-classic elementor-grid\" role=\"list\">\n\t\t\t\t<article class=\"elementor-post elementor-grid-item post-1487 post type-post status-publish format-standard has-post-thumbnail hentry category-other tag-cnc-machining-plastic tag-cnc-plastic-prototype tag-cnc-prototype-vs-injection-molding tag-injection-mold-manufacturing tag-injection-molded-parts tag-injection-molding-prototype tag-plastic-cnc-machining tag-plastic-prototype-manufacturing tag-prototype-vs-production-part\" role=\"listitem\">\n\t\t\t\t<a class=\"elementor-post__thumbnail__link\" href=\"https:\/\/samgomold.com\/fr\/cnc-plastic-prototypes-vs-injection-molded-parts-key-differences-engineers-should-understand\/\" tabindex=\"-1\" >\n\t\t\t<div class=\"elementor-post__thumbnail\"><img loading=\"lazy\" decoding=\"async\" width=\"800\" height=\"379\" src=\"https:\/\/samgomold.com\/wp-content\/uploads\/2026\/09\/87c48d0e-fea8-45cc-a4cf-e0d006dae247-1024x485.png\" class=\"attachment-large size-large wp-image-1490\" alt=\"\" srcset=\"https:\/\/samgomold.com\/wp-content\/uploads\/2026\/09\/87c48d0e-fea8-45cc-a4cf-e0d006dae247-1024x485.png 1024w, https:\/\/samgomold.com\/wp-content\/uploads\/2026\/09\/87c48d0e-fea8-45cc-a4cf-e0d006dae247-300x142.png 300w, https:\/\/samgomold.com\/wp-content\/uploads\/2026\/09\/87c48d0e-fea8-45cc-a4cf-e0d006dae247-768x364.png 768w, https:\/\/samgomold.com\/wp-content\/uploads\/2026\/09\/87c48d0e-fea8-45cc-a4cf-e0d006dae247-1536x728.png 1536w, https:\/\/samgomold.com\/wp-content\/uploads\/2026\/09\/87c48d0e-fea8-45cc-a4cf-e0d006dae247-18x9.png 18w, https:\/\/samgomold.com\/wp-content\/uploads\/2026\/09\/87c48d0e-fea8-45cc-a4cf-e0d006dae247.png 1822w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/div>\n\t\t<\/a>\n\t\t\t\t<div class=\"elementor-post__text\">\n\t\t\t\t<h3 class=\"elementor-post__title\">\n\t\t\t<a href=\"https:\/\/samgomold.com\/fr\/cnc-plastic-prototypes-vs-injection-molded-parts-key-differences-engineers-should-understand\/\" >\n\t\t\t\tCNC Plastic Prototypes vs. Injection Molded Parts: Key Differences Engineers Should Understand\t\t\t<\/a>\n\t\t<\/h3>\n\t\t\t\t<div class=\"elementor-post__meta-data\">\n\t\t\t\t\t<span class=\"elementor-post-date\">\n\t\t\tseptembre 29, 2026\t\t<\/span>\n\t\t\t\t<span class=\"elementor-post-avatar\">\n\t\t\tAucun commentaire\t\t<\/span>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-post__excerpt\">\n\t\t\t<p>Compare CNC plastic prototypes and injection molded parts in material properties, dimensions, warpage, surface finish, geometry, cost and production performance.<\/p>\n\t\t<\/div>\n\t\t\n\t\t<a class=\"elementor-post__read-more\" href=\"https:\/\/samgomold.com\/fr\/cnc-plastic-prototypes-vs-injection-molded-parts-key-differences-engineers-should-understand\/\" aria-label=\"En savoir plus sur CNC Plastic Prototypes vs. Injection Molded Parts: Key Differences Engineers Should Understand\" tabindex=\"-1\" >\n\t\t\tRead More \u00bb\t\t<\/a>\n\n\t\t\t\t<\/div>\n\t\t\t\t<\/article>\n\t\t\t\t<article class=\"elementor-post elementor-grid-item post-1463 post type-post status-publish format-standard has-post-thumbnail hentry category-mold-technical tag-draft-analysis-injection-molding tag-draft-angle-design-guidelines tag-injection-mold-design tag-injection-mold-draft-angle tag-plastic-part-ejection\" role=\"listitem\">\n\t\t\t\t<a class=\"elementor-post__thumbnail__link\" href=\"https:\/\/samgomold.com\/fr\/draft-angle-in-injection-mold-design-improving-part-quality-ejection-and-tooling-efficiency\/\" tabindex=\"-1\" >\n\t\t\t<div class=\"elementor-post__thumbnail\"><img loading=\"lazy\" decoding=\"async\" width=\"800\" height=\"379\" src=\"https:\/\/samgomold.com\/wp-content\/uploads\/2026\/09\/cover-1-1024x485.png\" class=\"attachment-large size-large wp-image-1467\" alt=\"\" srcset=\"https:\/\/samgomold.com\/wp-content\/uploads\/2026\/09\/cover-1-1024x485.png 1024w, https:\/\/samgomold.com\/wp-content\/uploads\/2026\/09\/cover-1-300x142.png 300w, https:\/\/samgomold.com\/wp-content\/uploads\/2026\/09\/cover-1-768x364.png 768w, https:\/\/samgomold.com\/wp-content\/uploads\/2026\/09\/cover-1-1536x728.png 1536w, https:\/\/samgomold.com\/wp-content\/uploads\/2026\/09\/cover-1-18x9.png 18w, https:\/\/samgomold.com\/wp-content\/uploads\/2026\/09\/cover-1.png 1822w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/div>\n\t\t<\/a>\n\t\t\t\t<div class=\"elementor-post__text\">\n\t\t\t\t<h3 class=\"elementor-post__title\">\n\t\t\t<a href=\"https:\/\/samgomold.com\/fr\/draft-angle-in-injection-mold-design-improving-part-quality-ejection-and-tooling-efficiency\/\" >\n\t\t\t\tDraft Angle in Injection Mold Design: Improving Part Quality, Ejection and Tooling Efficiency\t\t\t<\/a>\n\t\t<\/h3>\n\t\t\t\t<div class=\"elementor-post__meta-data\">\n\t\t\t\t\t<span class=\"elementor-post-date\">\n\t\t\tseptembre 28, 2026\t\t<\/span>\n\t\t\t\t<span class=\"elementor-post-avatar\">\n\t\t\tAucun commentaire\t\t<\/span>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-post__excerpt\">\n\t\t\t<p>Discover how draft angles affect injection mold design, part ejection, surface texture, dimensional accuracy, ribs, bosses and long-term tooling performance.<\/p>\n\t\t<\/div>\n\t\t\n\t\t<a class=\"elementor-post__read-more\" href=\"https:\/\/samgomold.com\/fr\/draft-angle-in-injection-mold-design-improving-part-quality-ejection-and-tooling-efficiency\/\" aria-label=\"En savoir plus sur Draft Angle in Injection Mold Design: Improving Part Quality, Ejection and Tooling Efficiency\" tabindex=\"-1\" >\n\t\t\tRead More \u00bb\t\t<\/a>\n\n\t\t\t\t<\/div>\n\t\t\t\t<\/article>\n\t\t\t\t<article class=\"elementor-post elementor-grid-item post-1443 post type-post status-publish format-standard has-post-thumbnail hentry category-injection-molding-process tag-injection-mold-design tag-injection-mold-shrinkage tag-injection-molding-dimensional-accuracy tag-injection-molding-shrinkage tag-mold-design-shrinkage tag-mold-shrinkage-calculation tag-molding-shrinkage-compensation tag-plastic-molding-tolerance tag-plastic-part-warpage tag-plastic-shrinkage-rate\" role=\"listitem\">\n\t\t\t\t<a class=\"elementor-post__thumbnail__link\" href=\"https:\/\/samgomold.com\/fr\/injection-molding-shrinkage-how-to-control-part-dimensions-from-mold-design-to-production\/\" tabindex=\"-1\" >\n\t\t\t<div class=\"elementor-post__thumbnail\"><img loading=\"lazy\" decoding=\"async\" width=\"800\" height=\"600\" src=\"https:\/\/samgomold.com\/wp-content\/uploads\/2026\/09\/mold-shrinkage-1024x768.png\" class=\"attachment-large size-large wp-image-1446\" alt=\"\" srcset=\"https:\/\/samgomold.com\/wp-content\/uploads\/2026\/09\/mold-shrinkage-1024x768.png 1024w, https:\/\/samgomold.com\/wp-content\/uploads\/2026\/09\/mold-shrinkage-300x225.png 300w, https:\/\/samgomold.com\/wp-content\/uploads\/2026\/09\/mold-shrinkage-768x576.png 768w, https:\/\/samgomold.com\/wp-content\/uploads\/2026\/09\/mold-shrinkage-16x12.png 16w, https:\/\/samgomold.com\/wp-content\/uploads\/2026\/09\/mold-shrinkage.png 1448w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/div>\n\t\t<\/a>\n\t\t\t\t<div class=\"elementor-post__text\">\n\t\t\t\t<h3 class=\"elementor-post__title\">\n\t\t\t<a href=\"https:\/\/samgomold.com\/fr\/injection-molding-shrinkage-how-to-control-part-dimensions-from-mold-design-to-production\/\" >\n\t\t\t\tInjection Molding Shrinkage: How to Control Part Dimensions from Mold Design to Production\t\t\t<\/a>\n\t\t<\/h3>\n\t\t\t\t<div class=\"elementor-post__meta-data\">\n\t\t\t\t\t<span class=\"elementor-post-date\">\n\t\t\tseptembre 16, 2026\t\t<\/span>\n\t\t\t\t<span class=\"elementor-post-avatar\">\n\t\t\tAucun commentaire\t\t<\/span>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-post__excerpt\">\n\t\t\t<p>Learn how injection molding shrinkage affects mold dimensions, tolerances and warpage, and how material, gate design, packing, cooling and mold trials help control final plastic part dimensions.<\/p>\n\t\t<\/div>\n\t\t\n\t\t<a class=\"elementor-post__read-more\" href=\"https:\/\/samgomold.com\/fr\/injection-molding-shrinkage-how-to-control-part-dimensions-from-mold-design-to-production\/\" aria-label=\"En savoir plus sur Injection Molding Shrinkage: How to Control Part Dimensions from Mold Design to Production\" tabindex=\"-1\" >\n\t\t\tRead More \u00bb\t\t<\/a>\n\n\t\t\t\t<\/div>\n\t\t\t\t<\/article>\n\t\t\t\t<article class=\"elementor-post elementor-grid-item post-1424 post type-post status-publish format-standard has-post-thumbnail hentry category-other tag-custom-injection-molding-supplier tag-injection-mold-manufacturer tag-injection-molding-supplier tag-plastic-injection-molding-manufacturer tag-plastic-parts-manufacturer\" role=\"listitem\">\n\t\t\t\t<a class=\"elementor-post__thumbnail__link\" href=\"https:\/\/samgomold.com\/fr\/how-to-choose-the-right-injection-molding-supplier-a-practical-buyers-guide\/\" tabindex=\"-1\" >\n\t\t\t<div class=\"elementor-post__thumbnail\"><img loading=\"lazy\" decoding=\"async\" width=\"800\" height=\"379\" src=\"https:\/\/samgomold.com\/wp-content\/uploads\/2026\/08\/right-supplier-1024x485.png\" class=\"attachment-large size-large wp-image-1428\" alt=\"\" srcset=\"https:\/\/samgomold.com\/wp-content\/uploads\/2026\/08\/right-supplier-1024x485.png 1024w, https:\/\/samgomold.com\/wp-content\/uploads\/2026\/08\/right-supplier-300x142.png 300w, https:\/\/samgomold.com\/wp-content\/uploads\/2026\/08\/right-supplier-768x364.png 768w, https:\/\/samgomold.com\/wp-content\/uploads\/2026\/08\/right-supplier-1536x727.png 1536w, https:\/\/samgomold.com\/wp-content\/uploads\/2026\/08\/right-supplier-18x9.png 18w, https:\/\/samgomold.com\/wp-content\/uploads\/2026\/08\/right-supplier.png 1823w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/div>\n\t\t<\/a>\n\t\t\t\t<div class=\"elementor-post__text\">\n\t\t\t\t<h3 class=\"elementor-post__title\">\n\t\t\t<a href=\"https:\/\/samgomold.com\/fr\/how-to-choose-the-right-injection-molding-supplier-a-practical-buyers-guide\/\" >\n\t\t\t\tHow to Choose the Right Injection Molding Supplier: A Practical Buyer\u2019s Guide\t\t\t<\/a>\n\t\t<\/h3>\n\t\t\t\t<div class=\"elementor-post__meta-data\">\n\t\t\t\t\t<span class=\"elementor-post-date\">\n\t\t\tao\u00fbt 23, 2026\t\t<\/span>\n\t\t\t\t<span class=\"elementor-post-avatar\">\n\t\t\tAucun commentaire\t\t<\/span>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-post__excerpt\">\n\t\t\t<p>Learn how to choose a reliable injection molding supplier by evaluating DFM capability, mold manufacturing, materials, quality control, production capacity, pricing, mold maintenance and technical communication.<\/p>\n\t\t<\/div>\n\t\t\n\t\t<a class=\"elementor-post__read-more\" href=\"https:\/\/samgomold.com\/fr\/how-to-choose-the-right-injection-molding-supplier-a-practical-buyers-guide\/\" aria-label=\"En savoir plus sur How to Choose the Right Injection Molding Supplier: A Practical Buyer\u2019s Guide\" tabindex=\"-1\" >\n\t\t\tRead More \u00bb\t\t<\/a>\n\n\t\t\t\t<\/div>\n\t\t\t\t<\/article>\n\t\t\t\t<\/div>\n\t\t\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>Compare CNC plastic prototypes and injection molded parts in material properties, dimensions, warpage, surface finish, geometry, cost and production performance.<\/p>","protected":false},"author":1,"featured_media":1490,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[16],"tags":[81,76,77,84,78,80,83,82,79],"class_list":["post-1487","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-other","tag-cnc-machining-plastic","tag-cnc-plastic-prototype","tag-cnc-prototype-vs-injection-molding","tag-injection-mold-manufacturing","tag-injection-molded-parts","tag-injection-molding-prototype","tag-plastic-cnc-machining","tag-plastic-prototype-manufacturing","tag-prototype-vs-production-part"],"acf":[],"_links":{"self":[{"href":"https:\/\/samgomold.com\/fr\/wp-json\/wp\/v2\/posts\/1487","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/samgomold.com\/fr\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/samgomold.com\/fr\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/samgomold.com\/fr\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/samgomold.com\/fr\/wp-json\/wp\/v2\/comments?post=1487"}],"version-history":[{"count":7,"href":"https:\/\/samgomold.com\/fr\/wp-json\/wp\/v2\/posts\/1487\/revisions"}],"predecessor-version":[{"id":1502,"href":"https:\/\/samgomold.com\/fr\/wp-json\/wp\/v2\/posts\/1487\/revisions\/1502"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/samgomold.com\/fr\/wp-json\/wp\/v2\/media\/1490"}],"wp:attachment":[{"href":"https:\/\/samgomold.com\/fr\/wp-json\/wp\/v2\/media?parent=1487"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/samgomold.com\/fr\/wp-json\/wp\/v2\/categories?post=1487"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/samgomold.com\/fr\/wp-json\/wp\/v2\/tags?post=1487"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}