{"id":55727,"date":"2019-05-30T10:42:55","date_gmt":"2019-05-30T02:42:55","guid":{"rendered":"http:\/\/facfox.com\/?post_type=kb&#038;p=55727"},"modified":"2021-01-26T06:54:10","modified_gmt":"2021-01-26T06:54:10","slug":"injection-molding-design-tips","status":"publish","type":"kb","link":"https:\/\/facfox.com\/docs\/kb\/injection-molding-design-tips","title":{"rendered":"Injection Molding Design Tips"},"content":{"rendered":"<div>\n<div class=\"container\">\n<div class=\"row clearfix\">\n<div class=\"col-md-8 column\">\n<p>Designing plastic parts for moldability has always been important for traditional injection molding processes, but it\u2019s particularly beneficial during rapid injection molding to ensure speed and quality remain constant during manufacturing. This guide examines many of the important design considerations that are encountered during injection molding part design and product.<\/p>\n<h2>What is Rapid Injection Molding?<\/h2>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<div>\n<div class=\"container\">\n<div class=\"row clearfix\">\n<div class=\"col-md-12 column\">\n<div>\n<p>Rapid injection molding a technology-driven process that leverages manufacturing automation. CAD models are sent directly to the production floor where mold milling begins, but in most cases, molds are fabricated from aluminum, not steel. This allows for faster and most cost-effective tooling when compared to traditional steel molds.<\/p>\n<p>There are number of surface finish options available and capabilities include side-action and hand-load inserts as well as simple overmolding and insert molding. Selective use of electrical discharge machining (EDM) is applied to improve mold features like corners and edges. The result is part production within a few weeks versus months when compared to traditional injection molding methods.<\/p>\n<p>Here some applications that work well for rapid injection molding and some industries taking advantage of the technology:<\/p>\n<div class=\"row\">\n<div class=\"col-md-8 col-sm-12\">\n<h3>Applications<\/h3>\n<ul class=\"indent\">\n<li>Iterate quickly with quick-turn prototypes<\/li>\n<li>Test functionality during product development with production-grade parts<\/li>\n<li>Test multiple materials<\/li>\n<li>Test multiple CAD models<\/li>\n<li>Make quick iterations<\/li>\n<li>Implement bridge tooling<\/li>\n<li>Leverage low-volume production for on-demand parts<\/li>\n<li>Manage demand volatility<\/li>\n<li>Get thousands of parts within days<\/li>\n<\/ul>\n<\/div>\n<div class=\"col-md-4 col-sm-12\">\n<h3>Industries<\/h3>\n<ul class=\"indent\">\n<li>Medical and health care<\/li>\n<li>Automotive<\/li>\n<li>Electronics<\/li>\n<li>Aerospace<\/li>\n<li>Unmanned aerial vehicles (UAVs)<\/li>\n<li>Consumer products<\/li>\n<li>Appliance<\/li>\n<li>Lighting<\/li>\n<li>Marine<\/li>\n<li>Robotics<\/li>\n<\/ul>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<div>\n<div class=\"container\">\n<div class=\"row clearfix\">\n<div>\n<div>\n<p><img decoding=\"async\" src=\"https:\/\/www.protolabs.com\/media\/1012179\/dfm1-fig-2-tiny.png\" alt=\"\" \/><\/p>\n<hr class=\"section-margin\" \/>\n<\/div>\n<\/div>\n<div class=\"col-md-8 column\">\n<div>\n<p>From wall thickness and radii to ramps and ribs, let\u2019s look at all of the factors designers and engineers should consider if their parts will be injection molded.<\/p>\n<h2>Wall Thickness<\/h2>\n<p>The most important design requirement for getting good molded parts: maintain constant wall thickness. Good injection-molded part design relies on consistent wall thickness to minimize the potential for warped or distorted parts.<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<div>\n<div class=\"container\">\n<div class=\"row clearfix\">\n<div>\n<div><img decoding=\"async\" src=\"https:\/\/www.protolabs.com\/media\/1012180\/dfm1-fig-3-tiny.png\" alt=\"\" \/><\/div>\n<\/div>\n<div class=\"col-md-8 column\">\n<div>\n<h2>Core Geometry<\/h2>\n<p>Core out parts to eliminate thick walls. You get the same functionality in a good molded part. Unnecessary thickness can alter part dimensions, reduce strength, and necessitate post-process machining.<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<div>\n<div class=\"container\">\n<div class=\"row clearfix\">\n<div class=\"col-md-12 column\">\n<div>\n<hr class=\"section-margin\" \/>\n<h3>Wall Thickness<\/h3>\n<table class=\"protolabs-table\" border=\"0\">\n<tbody>\n<tr>\n<th>MATERIAL<\/th>\n<th>RECOMMENDED WALL THICKNESS<\/th>\n<\/tr>\n<tr>\n<td>ABS<\/td>\n<td>0.045 in. &#8211; 0.140 in.<\/td>\n<\/tr>\n<tr>\n<td>Acetal<\/td>\n<td>0.030 in. &#8211; 0.120 in.<\/td>\n<\/tr>\n<tr>\n<td>Acrylic<\/td>\n<td>0.025 in. &#8211; 0.150 in.<\/td>\n<\/tr>\n<tr>\n<td>Liquid Crystal Polymer<\/td>\n<td>0.030 in. &#8211; 0.120 in.<\/td>\n<\/tr>\n<tr>\n<td>Long-fiber Reinforced Plastics<\/td>\n<td>0.075 in. &#8211; 1.000 in.<\/td>\n<\/tr>\n<tr>\n<td>Nylon<\/td>\n<td>0.030 in. &#8211; 0.115 in.<\/td>\n<\/tr>\n<tr>\n<td>Polycarbonate<\/td>\n<td>0.040 in. &#8211; 0.150 in.<\/td>\n<\/tr>\n<tr>\n<td>Polyester<\/td>\n<td>0.025 in. &#8211; 0.125 in.<\/td>\n<\/tr>\n<tr>\n<td>Polyethylene<\/td>\n<td>0.030 in. &#8211; 0.200 in.<\/td>\n<\/tr>\n<tr>\n<td>Polyphenylene sulfide<\/td>\n<td>0.020 in. &#8211; 0.180 in.<\/td>\n<\/tr>\n<tr>\n<td>Polypropylene<\/td>\n<td>0.025 in. &#8211; 0.150 in.<\/td>\n<\/tr>\n<tr>\n<td>Polystyrene<\/td>\n<td>0.035 in. &#8211; 0.150 in.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>Note: These are general guidelines, subject to part geometry and molded construction. Larger parts shouldn&#8217;t be designed with the minimum wall thickness. FacFox\u2019 general rule for wall thickness is 0.040 to 0.140 inches.<\/p>\n<hr class=\"section-margin\" \/>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<div>\n<div class=\"container\">\n<div class=\"row clearfix\">\n<div>\n<div>\n<h3>Ramps<\/h3>\n<p>Eliminate sharp transitions that cause molded-in stress.<\/p>\n<\/div>\n<\/div>\n<div>\n<div><img decoding=\"async\" src=\"https:\/\/www.protolabs.com\/media\/1012181\/dfm1-fig-4-tiny.png\" alt=\"\" \/><\/div>\n<\/div>\n<div>\n<div>\n<h3>Fillets<\/h3>\n<p>Design part features that support themselves.<\/p>\n<\/div>\n<\/div>\n<div>\n<div><img decoding=\"async\" src=\"https:\/\/www.protolabs.com\/media\/1012182\/dfm1-fig-5-tiny.png\" alt=\"\" \/><\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<div>\n<div class=\"container\">\n<div class=\"row clearfix\">\n<div>\n<div>\n<h3>Radii<\/h3>\n<p>Sharp corners weaken parts, causing molded-in stress from resin flow. Adding radii in sharp corners is suggested.<\/p>\n<\/div>\n<\/div>\n<div>\n<div><img decoding=\"async\" src=\"https:\/\/www.protolabs.com\/media\/1012185\/dfm1-fig-6-tiny.png\" alt=\"\" \/><\/div>\n<\/div>\n<div>\n<div>\n<h3>Ribs<\/h3>\n<p>To prevent sink, ribs should be no more than 60% of the wall\u2019s thickness.<\/p>\n<\/div>\n<\/div>\n<div>\n<div><img decoding=\"async\" src=\"https:\/\/www.protolabs.com\/media\/1012188\/dfm1-fig-7-tiny.png\" alt=\"\" \/><\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<div>\n<div class=\"container\">\n<div class=\"row clearfix\">\n<div>\n<div>\n<h3>Bosses<\/h3>\n<p>Don&#8217;t create thick sections with screw bosses since tick sections can cause sink and voids in your part.<\/p>\n<\/div>\n<\/div>\n<div>\n<div><img decoding=\"async\" src=\"https:\/\/www.protolabs.com\/media\/1012189\/dfm1-fig-8-tiny.png\" alt=\"\" \/><\/div>\n<\/div>\n<div>\n<div>\n<h3>Draft<\/h3>\n<p>Draft (slope the vertical walls) as much as possible\u2014this makes it easier to eject parts without drag marks or ejector punch marks.<\/p>\n<\/div>\n<\/div>\n<div>\n<div><img decoding=\"async\" src=\"https:\/\/www.protolabs.com\/media\/1012190\/dfm1-fig-9-tiny.png\" alt=\"\" \/><\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<div>\n<div class=\"container\">\n<div class=\"row clearfix\">\n<div class=\"col-md-12 column\">\n<div class=\"image-content\">\n<div class=\"image-wrapper float-right image-small\"><\/div>\n<div class=\"image-block-content-normal\">\n<h3>Core-cavity<\/h3>\n<p>When you draft, use core-cavity instead of ribs if you can. It allows you to have constant wall thickness rather than walls with a thick base. We can mill molds with better surface finish and deliver better parts faster.<\/p>\n<p><img fetchpriority=\"high\" decoding=\"async\" class=\"alignnone\" src=\"https:\/\/www.protolabs.com\/media\/6379\/dfm1-fig-10.png?anchor=center&amp;mode=crop&amp;width=285&amp;height=154&amp;rnd=131327999240000000\" alt=\"core-cavity approach\" width=\"566\" height=\"306\" \/><\/p>\n<h3>Deep Milling<\/h3>\n<p>Draft the part as much as possible. This allows us to make deeper features for you. Draft allows us to reduce tool chatter and cosmetic defects when milling deep walls. If you can fit it in, use 1 degree of draft or more. On core-cavity designs, try to use 2 degrees or more. A rough rule of thumb is 1 degree of draft for each of the first 2 inches of depth. From 2 to 4 inches of depth, either 3 degrees of draft or a minimum of 1\/8 in. thickness may be required.<\/p>\n<\/div>\n<\/div>\n<div class=\"image-content\">\n<div class=\"image-wrapper float-right image-small\"><\/div>\n<div class=\"image-block-content-normal\">\n<h3>Undercuts<\/h3>\n<p>An undercut is an area of the part that shadows another area of the part, creating an interlock between the part and one or both of the mold halves. The left image (1) illustrates a clip with undercut feature. On the right image (2), an access hole beneath the undercut allows the mold to protrude through the part and provide the needed latch shutoff geometry.<\/p>\n<h3><img decoding=\"async\" class=\"alignnone\" src=\"https:\/\/www.protolabs.com\/media\/6382\/dfm1-fig-13.png?anchor=center&amp;mode=crop&amp;width=285&amp;height=154&amp;rnd=131327999280000000\" alt=\"undercuts in part design\" width=\"550\" height=\"297\" \/><\/h3>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<div>\n<div class=\"container\">\n<div class=\"row clearfix\">\n<div>\n<div>\n<h3>Side-Actions<\/h3>\n<p>Side-actions can form undercuts on the outside of your part. Undercuts must be on or connected to the parting line. They must be in the plane of the parting line. Undercuts must be connected and perpendicular to the direction the mold is opening.<\/p>\n<\/div>\n<\/div>\n<div>\n<div><img decoding=\"async\" src=\"https:\/\/www.protolabs.com\/media\/1012191\/dfm1-fig-11-tiny.png\" alt=\"\" \/><\/div>\n<\/div>\n<div>\n<div>\n<h3>Bumpoffs<\/h3>\n<p>A bumpoff is a small undercut in a part design that can be safely removed from a straight-pull mold without the use of side-actions. Bumpoffs can be used to solve some simple slight undercuts, but are sensitive to geometry, material type.<\/p>\n<\/div>\n<\/div>\n<div>\n<div><img decoding=\"async\" src=\"https:\/\/www.protolabs.com\/media\/1012192\/dfm1-fig-12-tiny.png\" alt=\"\" \/><\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<div>\n<div class=\"container\">\n<div class=\"row clearfix\">\n<div class=\"col-md-12 column\">\n<div>\n<h3>Pickouts<\/h3>\n<p>A pickout is a separate piece of metal that is inserted into the mold to create an undercut. It is ejected with the part, then removed by the operator and re-inserted in the mold. Using a pickout overcomes many shape and positioning restrictions, but is more costly than sliding shutoffs, or using a side-action.<\/p>\n<h3>Steel Core Pins<\/h3>\n<p>These holes can be made with steel core pins in the mold. A steel pin is strong enough to handle the stress of ejection and its surface is smooth enough to release cleanly from the part without draft. There shouldn\u2019t be any cosmetic effect on the resulting part; if there is, it will be inside the hole where it won\u2019t be seen.<\/p>\n<h3>Logos and Text on Parts<\/h3>\n<p>Textured surfaces, molded part numbers, and company logos look cool, but be prepared to pay a bit extra for these and other non-mission critical features. That said, permanent part numbers are a requirement for many aerospace and military applications.<\/p>\n<ul class=\"indent\">\n<li>Use a mill-friendly font such as Century Gothic Bold, Arial, or Verdana (san-serif fonts)<\/li>\n<li>Keep it above 20 pt.<\/li>\n<li>Don\u2019t go much deeper than 0.010 to 0.015 inches<\/li>\n<li>Be prepared to increase draft if part ejection is a concern<\/li>\n<\/ul>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<div>\n<div class=\"container\">\n<div class=\"row clearfix\">\n<div>\n<div>\n<h3>Tab Gates<\/h3>\n<p>Thin edges restrict flow and can break during gate trimming. We need somewhere thick to gate into your part. There may be alternatives, so please contact one of our applications engineers.<\/p>\n<p>&nbsp;<\/p>\n<\/div>\n<\/div>\n<div>\n<div><img decoding=\"async\" src=\"https:\/\/www.protolabs.com\/media\/1012193\/dfm1-fig-16-tiny.png\" alt=\"\" \/><\/div>\n<\/div>\n<div>\n<div>\n<h3>Self-Mating Parts<\/h3>\n<p>Identical parts that flip over and mate to themselves are possible and save the cost of a second mold. Elements include pegs and holes, interlocking rims, and hooks and latches.<\/p>\n<\/div>\n<\/div>\n<div>\n<div><img decoding=\"async\" src=\"https:\/\/www.protolabs.com\/media\/1011688\/dfm1-fig-18-tiny.png\" alt=\"\" \/><\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<div>\n<div class=\"container\">\n<div class=\"row clearfix\">\n<div class=\"col-md-12 column\">\n<div>\n<h3>Tolerances<\/h3>\n<ul class=\"indent\">\n<li>We can hold about \u00b10.003 in. machining accuracy.<\/li>\n<li>Shrink tolerance depends mainly on part design and resin choice. It varies from 0.002 in.\/in. for stable resins like ABS and polycarbonate to 0.025 in.\/in. for unstable resins like TPE.<\/li>\n<li>There are techniques for getting the most accuracy out of our process. Please contact an applications engineer.<\/li>\n<\/ul>\n<h2>Material Selection<\/h2>\n<p>When choosing a material for your part, relevant properties might include mechanical, physical, chemical resistance, heat, electrical, flammability or UV resistance. Resin manufacturers, compounders and independent resin search engines have data online. Here are a quick look at some common commodity and engineering resins.<\/p>\n<div class=\"two-columns\">\n<h3>Commodity Resins<\/h3>\n<h4><strong>Polypropylene<\/strong><\/h4>\n<ul>\n<li>Soft<\/li>\n<li>Tough<\/li>\n<li>Cheap<\/li>\n<li>Chemical resistant<\/li>\n<li>Makes good living hinges<\/li>\n<\/ul>\n<h4><strong>Polyethylene<\/strong><\/h4>\n<ul>\n<li>Soft<\/li>\n<li>Tough<\/li>\n<li>Cheap<\/li>\n<li>Chemical resistant<\/li>\n<li>High Density<\/li>\n<li>Low Density<\/li>\n<\/ul>\n<h4><strong>Polystyrene<\/strong><\/h4>\n<ul>\n<li>Hard<\/li>\n<li>Clear<\/li>\n<li>Cheap<\/li>\n<li>Brittle but can be toughened<\/li>\n<\/ul>\n<h3>Engineering Resins<\/h3>\n<h4><strong>ABS<\/strong><\/h4>\n<ul>\n<li>Inexpensive<\/li>\n<li>Impact Resistant<\/li>\n<li>Equipment and handheld housings<\/li>\n<li>Susceptible to sink<\/li>\n<\/ul>\n<h4><strong>Acetal<\/strong><\/h4>\n<ul>\n<li>More expensive<\/li>\n<li>Strong<\/li>\n<li>Good lubricity and machinability<\/li>\n<li>Very sensitive to excess wall thickness<\/li>\n<\/ul>\n<h4><strong>LCP<\/strong><\/h4>\n<ul>\n<li>Very expensive<\/li>\n<li>Very strong<\/li>\n<li>Fills very thin parts<\/li>\n<li>Weak knit lines<\/li>\n<\/ul>\n<h4><strong>Nylon<\/strong><\/h4>\n<ul>\n<li>Reasonable cost<\/li>\n<li>Very strong<\/li>\n<li>Susceptible to shrink and warp, particularly glass-filled<\/li>\n<li>Absorbs water &#8211; dimensional and property change<\/li>\n<\/ul>\n<h4><strong>Polycarbonate<\/strong><\/h4>\n<ul>\n<li>Moderate cost<\/li>\n<li>Very tough<\/li>\n<li>Good dimensional accuracy<\/li>\n<li>Susceptible to chemical stress cracking, voids<\/li>\n<\/ul>\n<h4><strong>PBT, PET, PPS, PSU, PES, PEI, and many others<\/strong><\/h4>\n<\/div>\n<h2>Selecting Colorants<\/h2>\n<p>We do not color-match resins at FacFox, but rather use a 3 percent salt\/pepper mixture for most stocked, re-compounded material, or customer-supplied colorants.<\/p>\n<p>Stock colors from the resin vendor are typically black and natural. Natural might be white, beige, amber or another color. Semi-custom colors are created when colorant pellets are added to natural resins. There is no added charge for our inventory colors. They may not be an exact match and may create streaks or swirls in parts. Custom colors that need to match an exact Pantone or color chip need to be compounded with a resin supplier. This process is slower and more expensive, but produces a more accurate match.<\/p>\n<h3>Resin Additives<\/h3>\n<p><strong>Short glass fibers<\/strong> are used to strengthen a composite and reduce creep, especially at higher temperatures. They make the resin stronger, stiffer, and more brittle. They can cause warp due to the difference in cooling shrink between the resin and the fibers.<\/p>\n<p><strong>Carbon fiber<\/strong> is used to strengthen and\/or stiffen a composite and also to aid in static dissipation. It has the same limitations as glass fibers. Carbon fiber can make plastic very stiff.<\/p>\n<p><strong>Minerals<\/strong> such as talc and clay are often used as fillers to reduce the cost or increase the hardness of finished parts. Since they do not shrink as much as resins do when cooled, they can reduce warping.<\/p>\n<p><strong>PTFE (Teflon) and molybdenum disulfide<\/strong> are used to make parts self-lubricating in bearing applications.<\/p>\n<p><strong>Long glass fibers<\/strong> are used like short glass fibers to strengthen and reduce creep, but make the resin much stronger and stiffer. The downside is that they can be particularly challenging to mold parts with thin walls and\/or long resin flows.<\/p>\n<p><strong>Aramid (Kevlar) fibers<\/strong> are like less-abrasive glass fibers only not as strong.<\/p>\n<p><strong>Glass beads and mica flakes<\/strong> are used to stiffen a composite and reduce warping and shrinkage. With high loading, they can be challenging to inject.<\/p>\n<p><strong>Stainless steel fibers<\/strong> are used to control EMI (electromagnetic interference) and RFI (radio frequency interference) typically in housings for electronic components. They are more conductive than carbon fiber.<\/p>\n<p><strong>UV inhibitor<\/strong> for outdoor applications.<\/p>\n<p><strong>Static treatments<\/strong> make resins dissipate static.<\/p>\n<p>For more information, feel free to send a <a href=\"\/make\">manual project review request<\/a> or send support request to <a href=\"mailto:info@facfox.com\">info@facfox.com<\/a>!<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Designing plastic parts for moldability has always been important for traditional injection molding processes, but it\u2019s particularly beneficial during rapid injection molding to ensure speed and quality remain constant during manufacturing. This guide examines many of the important design considerations that are encountered during injection molding part design and product. What is Rapid Injection Molding? [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","template":"","meta":{"footnotes":""},"kbtopic":[47],"kbtag":[116,75],"class_list":["post-55727","kb","type-kb","status-publish","hentry","kbtopic-design","kbtag-injection","kbtag-injection-molding"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.1 (Yoast SEO v27.1.1) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Injection Molding Design Tips - FacFox Docs<\/title>\n<meta name=\"description\" content=\"Designing plastic parts for moldability has always been important for traditional injection molding processes, but it\u2019s particularly beneficial during\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/facfox.com\/docs\/kb\/injection-molding-design-tips\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Injection Molding Design Tips\" \/>\n<meta property=\"og:description\" content=\"Designing plastic parts for moldability has always been important for traditional injection molding processes, but it\u2019s particularly beneficial during\" \/>\n<meta property=\"og:url\" content=\"https:\/\/facfox.com\/docs\/kb\/injection-molding-design-tips\" \/>\n<meta property=\"og:site_name\" content=\"FacFox Docs\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/facebook.com\/facfox3d\" \/>\n<meta property=\"article:modified_time\" content=\"2021-01-26T06:54:10+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.protolabs.com\/media\/1012179\/dfm1-fig-2-tiny.png\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:site\" content=\"@facfox3d\" \/>\n<meta name=\"twitter:label1\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data1\" content=\"8 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/facfox.com\/docs\/kb\/injection-molding-design-tips\",\"url\":\"https:\/\/facfox.com\/docs\/kb\/injection-molding-design-tips\",\"name\":\"Injection Molding Design Tips - 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