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OptiMIM - Resources - L1

<p>With the abundance of metalworking solutions available, engineers frequently inquire about MIM (Metal Injection Molding) and its ideal applications. MIM merges thermoplastic injection molding and powder metallurgy to create intricate, dense, and high-performing metal components. However, the key question lies in identifying when MIM yields the highest ROI compared to other processes for a specific project.</p><p>The suitability of a part for MIM is primarily determined by factors such as size, weight, and volume. Overly large parts consume excessive space on MIM molds, impacting cost-effectiveness. Nonetheless, the complexity of the part often dictates the potential ROI manufacturers can achieve with MIM.</p><h2>Part Sizes for Metal Injection Molding</h2><p>The limiting factors for the <a href="/metal-injection-molding/process" target="_self">metal injection molding process</a> are determined by the size capacity of the mold and how much raw material is required per component. For these reasons, MIM components are typically smaller than the average palm and weigh under 60 grams.</p><h3>Metal Injection Molding feedstock cost</h3><p>MIM feedstock is a combination of very fine, <a href="/materials/special-and-custom-materials" target="_self">customizable metal powders</a> and polymers, which tends to be more expensive than your typical molten casting alloys. Because of this, material cost is one of the biggest limiting factors in the MIM decision making process. At <a href="/about-us/company-overview" target="_self">OptiMIM</a>, our engineering team can help to optimize your component’s features to minimize wall thickness for the most ergonomic design.</p><p>Mold space and materials limit most MIM components to less than 3 inches in length, but what the MIM process lacks in size capacity, <strong>it more than makes up for in part complexity, repeatability, and scalability.</strong></p><h3>Take Advantage of Increased Complexity for Maximum ROI</h3><p>While MIM tooling has a higher initial ticket price than our competitors who machine wrought stock, machine investment casting, and machine conventional permanent molding, MIM part cost remains constant with additional complexity and molded features.</p><p>MIM is capable of achieving intricate features such as dovetails, slots, undercuts, fins, internal and external threads, or complex curved surfaces—just to name a few. MIM can also produce cylindrical parts of unique geometries with greater length to diameter ratios than most other casting technologies, as well as consolidate several components into one for better functionality.</p>

Dyancast_Resources_Metal Nuts

Identify key part characteristics—like complexity, size, and material needs—that make projects ideal candidates for metal injection molding.

What Makes a Good Fit For MIM | OptiMIM Article

Metal injection molding (MIM) is ideal for large batches of small, complex parts, while investment casting (IC) is better suited for smaller lot sizes of larger parts. 

What Makes a Good Fit For MIM

<h2>Get your free copy of our MIM Design Guide</h2><p>Learn about <a href="/metal-injection-molding/process" target="_self">metal injection molding (MIM)</a>, and discover design freedom from the traditional constraints of trying to mold stainless steel, nickel iron, copper, titanium, and other metals in <a href="/additional-capabilities/engineering" target="_self">part designs</a>.</p><p><strong>Download a free copy of the MIM Design Guide to learn:</strong></p><ul><li>The characteristics of the ideal candidates for MIM</li><li>How complexity and cost stack up vs machined parts</li><li>Which limitations of traditional metalworking can be avoided</li><li>The “clean slate” approach to MIM design</li></ul><p><strong>Fill out the form to get a free copy of the 66-page MIM Design Guide.</strong></p><p><em></em></p>

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Download this design guide to discover best practices for maximizing performance, manufacturability, and material choice in MIM components.

MIM Design Guide | OptiMIM Whitepaper

Download our free 66-page MIM Design Guide to discover the design freedom of metal injection molding and learn how to overcome traditional metalworking limitations with your part designs. 

MIM Design Guide

<p>Metal Injection Molding (MIM) is a revolutionary technology that combines the versatility of plastic injection molding with the strength of metal. This advanced manufacturing process is transforming the way precision metal components are produced.</p><h2>Why Metal Injection Molding?</h2><p><a href="/metal-injection-molding" target="_self">Metal Injection Molding</a> is at the forefront of cutting-edge technology, enabling the cost-effective production of complex, high-quality metal parts. By merging the design flexibility of plastic injection molding with the strength and performance of metals, MIM opens a world of possibilities across industries such as <a href="/industries/automotive" target="_self">automotive</a>, <a href="/industries/commercial-and-industrial-parts" target="_self">commercial &amp; industrial products</a>, <a href="/industries/medical" target="_self">medical</a>, <a href="/industries/consumer-electronics" target="_self">electronics</a>, and more. </p><h2>Benefits of Metal Injection Molding:</h2><ul><li>Complex Geometries: Unlock the potential for intricate part production. </li><li>Cost-Effective: Optimize material usage and reduce costs for enhanced affordability. </li><li>High Precision: Achieve tight tolerances and excellent finishes for consistent quality. </li><li>Wide Material Selection: Harness a variety of materials, including stainless steel, titanium, copper, and more. </li><li>Scalability: Seamlessly transition from prototypes to high-volume production. </li></ul><p><strong>Webinar Details: </strong></p><ul><li><strong>Metal Injection Molding (MIM) 101</strong></li><li><strong>When:</strong> On-Demand<br /></li></ul><p><strong>Fill out the form to access the recording. </strong></p>

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Join OptiMIM’s MIM 101 session to learn the fundamentals of powder metallurgy, mold design, sintering, and complex component fabrication.

Metal Injection Molding 101 | OptiMIM Webinar

David Fuerst

Sr. Project Manager

Metal Injection Molding 101

<p>Metal injection molding (MIM) is a technology that addresses many current manufacturing challenges. OptiMIM utilizes the injection molding process to produce net-shaped parts, ideal for high-performance applications demanding exceptional density, strength, and corrosion resistance. These parts consistently outperform industry standards in mechanical and physical properties. <a href="/additional-capabilities/engineering" target="_self">Designing for metal injection molding</a> requires careful consideration of several factors to ensure project success. Continue reading to explore the distinctive variables incorporated into our award-winning components.</p><h2>Metal Injection Molding Design - Molding Variables</h2><p>Designing for metal injection molding requires careful consideration of various factors. The mold can be a two-plate or three-plate design. When designing the part, it's essential to determine the placement of details and features, such as gating and gate location. In some cases, a single gate or multiple gates may be necessary, depending on the part's geometry.</p><h3>Parting Lines</h3><p>It's also crucial to consider the parting line and parting line witness. Every part has a parting line related to the molding process. However, it's important to be mindful of the application and understand how the parting line's location might affect the part's form, fit, or function. Ideally, the parting line should not be on a functional surface.</p><h3>Ejector Marks</h3><p>Another important consideration is ejector marks. All parts must be ejected from the mold, so the ejector location must be carefully evaluated in relation to the part's function. In certain instances, sleeve ejection can be used to minimize or eliminate ejector marks.</p><h3>Wall Features &amp; Wall Thickness</h3><p>Additional factors to consider include thin wall features, especially those measuring 0.020 inches or less in thickness. When injecting thin features into a mold, there is a risk of breakage if the ejection process is not performed correctly. Our engineers carefully evaluate these factors and collaborate with clients prior to developing new programs.</p><p>For the full list of molding variables, download OptiMIM’s MIM Design webinar!</p><h2>Metal Injection Molding Design Considerations</h2><p>After we get past molding variables, we start looking at <a href="/additional-capabilities/part-improvement" target="_self">metal injection molding design considerations</a>. And due to the complexity of the MIM process, there are quite a few design features that need to be addressed at each stage.</p><h3>Drag Effect</h3><p>g effect which is merely the fact that inherent to the MIM process, a part shrinks on the tiles when they’re placed into our sintering ovens. Keep in mind from the MIM 101 webinar, that on average, a MIM part will shrink about 20 percent. Specific shrink rates depend on the grade of the material and our engineering team designs the part with shrinking factored in.</p><h3>Sag Effect</h3><p>The second effect that occurs during the sintering process is the sag effect. During sintering, parts become relatively soft and because of gravity, cantilevered or unsupported features tend to want to run or sag. To design for the sag effect, we create a design that counters the effects of gravity. We can add special centers or ceramics that could be individual blocks, or custom machine ceramics to maintain those unsupported features.</p><p>Another option is working with you to modify your design to accommodate this goal without adding any additional costs. We look to add features like gussets on the part. Again, this would be ideal as long as it doesn’t affect your form, fit, or function of your application.</p><h3>Draft Angles</h3><p>The design characteristics for metal injection molding are very similar to plastic injection molding. However, the one main exception is the requirement of draft angles. In most cases for metal injection molding, we don’t require any draft angles at all. It’s a rare requirement.</p><p>The only time we might require a draft angle is if we have a high aspect ratio feature and we need to pull the mold, such as a thin wall section or a long core pin. We may introduce a half-a-degree draft just for additional relief, but for the most part, we don’t require a draft angle. The reason; we have a paraffin wax in the feedstock and that wax acts as a mold release agent so it allows us to have, for the most part, straight holes in the mold. There’s very little shrinkage that occurs at the molding stage. For that reason, it allows us to not require a draft angle.</p><h3>Wall Thickness</h3><p>Another thing about metal injection molding that’s very similar to that of plastic injection molding is uniform wall thickness. An ideal MIM part has similar wall thickness throughout so that we can control the shrinkage variability.</p><h3>Undercuts</h3><p>At OptiMIM, we design components with a collapsible core, a mold feature that enables us to incorporate undercuts directly into the molding process, thereby reducing the need for secondary operations and costs. Undercuts are often impractical or challenging with other manufacturing methods, but they are achievable with metal injection molding. Consulting with our engineering team prior to designing for undercuts is highly recommended.</p><p>To learn more about mold and design variables for the metal injection molding process, I invite you to download our free webinar. We’ll discuss the above topics in more detail and cover more on:</p><ul><li>Knurling</li><li>Custom feedstock</li><li>Gating</li><li>Secondary operations</li><li>Solving functional or assembly issues</li><li>And more! </li></ul><p>OptiMIM works with many of the world’s most demanding manufacturers—from <a href="/industries/medical" target="_self">medical</a> and <a href="/industries/defense" target="_self">defense</a> to <a href="/industries/automotive" target="_self">automotive</a> and <a href="/industries/consumer-electronics" target="_self">consumer electronics</a>. They know we deliver the quality and performance they need to create better products, more consistently, whatever the volume. From the initial design stage all the way through to full production, let our team of experienced engineers help you drive your business forward—contact us today!</p>

Metal part, ruler, and blueprint representing die cast design for manufacturing

Dynacast_Resources_DFM

Understand critical DFM principles specific to MIM, helping optimize part features, draft angles, and material flow for successful component manufacturing.

Designing for Metal Injection Molding | OptiMIM Article

Metal injection molding (MIM) offers a unique solution for high-performance, high-density, and high-strength applications. 

Designing for Metal Injection Molding

<p>At OptiMIM, a key differentiator is the customizable feedstock, produced in-house. This feedstock is made by combining very fine metal powders with thermoplastic and wax binders in a precise recipe to achieve between 95 and 100% theoretical density and close tolerances over high-production runs.</p><p>Making <a href="/materials" target="_self">metal injection molding materials</a> to achieve higher strength and density sounds great on paper—but that doesn’t even begin to cover all of the problems that can be solved with proprietary feedstock capabilities.</p><p>In this webinar, MetalSolutions series veteran John O’Donnell and OptiMIM Engineering and Tooling Manager Steve LeBlanc will cover the many ways MIM materials can solve common manufacturing problems, including:</p><ul><li>Modifying material to suit project requirements</li><li>Creating custom material to suit project requirements</li><li>Achieving higher strength, density, and durability than with powder metallurgy</li><li>Shortening your supply chain</li><li>Greater design freedom, and more!</li></ul><p><strong>Please fill out the form to download our free on demand webinar.</strong></p>

An engineer operating a metal injection molding machine

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Learn how to troubleshoot common issues in MIM projects, from material flow concerns to final part properties, with insights from OptiMIM specialists.

How to Solve Problems with MIM Materials | OptiMIM Webinar

This webinar explores how customizable metal injection molding (MIM) materials can solve manufacturing challenges by enabling higher strength, tailored properties, shorter supply chains, and greater design freedom. 

How to Solve Problems with MIM Materials

<h2>Advancing Spinal Surgery Through Smarter Manufacturing</h2><p>Spinal procedures are inherently complex, requiring precise placement of surgical instruments and exceptional dexterity. Even when complications are avoided, traditional methods often demand forceful manipulation, leading to longer and more painful recovery periods for patients.</p><p>Spine Wave, Inc., a Connecticut-based medical device company founded in 2001, is addressing these challenges by developing innovative surgical solutions specifically designed for spinal treatments.</p><h2>Engineering Innovation: The Velocity® Expandable Interbody Device</h2><p>Among Spine Wave’s standout innovations is the Velocity® Expandable Interbody Device, which utilizes groundbreaking expandable implant technology. The device features a small spacer inserted into the spine that expands once in place, allowing for improved stability and alignment.</p><p>Velocity® is deployed using a handheld gun loaded with a cartridge containing the implant. Surgeons activate the trigger to insert the contents into the surgical site and can load multiple cartridges per procedure — seamlessly completing several implant expansions within a single surgery.</p><p>However, as Manufacturing Engineer Zachary Sniffen and Senior Quality Engineer John Kapp emphasize, every step leading up to implantation must be equally precise to ensure the success of the procedure.</p><h2>Solving Shipping and Assembly Challenges</h2><p>While Spine Wave is known for innovation in spinal technologies, getting their next-generation instruments safely and efficiently into surgeons’ hands was a costly logistical challenge. Components required extra care during shipping to avoid misalignment or damage before surgery.</p><p>To overcome this, Spine Wave’s engineers turned to OptiMIM for a more cost-effective, reliable solution, one that would ensure smooth delivery right out of the box.</p><p>Preparing the Velocity® device for surgery involves removing cartridges from sterile packaging and snapping them onto the delivery gun. As Sniffen explains, “Surgeons could have trouble mating the gun to the cartridge if components inside became misaligned during shipping.”</p><p>To solve this, Spine Wave developed a shipping lock, a compact, clip-like piece that holds components securely in place during transport. When the cartridge is loaded onto the gun, the mechanism automatically disengages, allowing for smooth, uninterrupted assembly in the operating room.</p><h2>Transitioning from Machined Parts to MIM Components</h2><p>Initially, the shipping locks were machined from raw bar stock, a process that delivered precision but at a high cost. “We had to change processes, and we knew metal injection molding would give us a cost reduction,” says Kapp. That’s when the team contacted OptiMIM.</p><p>“Complex geometries and intricately shaped features make <a href="/industries/medical" target="_self">medical devices</a> a great fit for the MIM process,” explains OptiMIM. “Spine Wave could have spent six to seven times more machining this part than producing it through MIM.”</p><p>OptiMIM collaborated closely with Spine Wave’s engineers to optimize manufacturability, achieve tighter tolerances, and deliver consistent quality at scale. “We saw the best opportunity for a quality part from OptiMIM — and their willingness to work with us on our design intent,” Sniffen says.</p><p>Ultimately, the switch to MIM not only reduced costs but also opened the door to greater production efficiency and scalability. In fact, Spine Wave later extended the shipping lock’s application to a second product. “It paid for itself fairly quickly,” says Sniffen. “It was pretty much a no-brainer for us.”</p><h2>The OptiMIM Partnership: Experience, Expertise, and Collaboration</h2><p>Transitioning to MIM presented unique engineering challenges. “With projecting features like the shipping lock posts, the injection molding process always presents challenges with cooling, flexing, and bowing,” says Kapp.</p><p>To address this, Spine Wave partnered with OptiMIM’s experts through a <a href="/additional-capabilities/engineering" target="_self">Design for Manufacturing (DFM)</a> approach, optimizing the part for MIM production and working hands-on at OptiMIM’s Portland, Oregon facility.</p><p>During development, Spine Wave’s engineers discovered (or rediscovered) <a href="/about-us/company-overview" target="_self">OptiMIM’s century-long legacy of in-house MIM expertise</a>. Kapp recalls working with the company years earlier under its original name, Kinetics: “They’ve done some very technically challenging work. It was the right choice for this project.”</p><p>The collaboration delivered measurable success:</p><ul><li><strong>Target dates met</strong></li><li><strong>Significant cost reduction</strong></li><li><strong>Seamless transition</strong> from the machined part to MIM</li></ul><p>“For a quality engineer, having nothing to report is a resounding endorsement,” Kapp says.</p><h2>A Trusted Partner in Precision Manufacturing</h2><p>“The engineers at OptiMIM had the foresight to see a potential issue on a susceptible part that didn’t appear during development,” Kapp adds. “Because of their expertise, we were able to circumvent the issue and avoid any inventory delays.”</p><p>By combining deep MIM experience, collaborative engineering, and design optimization, OptiMIM helped Spine Wave achieve cost-effective, high-performance results — proving how transitioning from machining to MIM can enhance precision, reduce cost, and improve manufacturability across the medical device industry.</p>

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See how transitioning from CNC machining to MIM allowed for significant cost reductions and precision improvements in a high-volume application

Machining to MIM:  Precision & Cost Savings | OptiMIM

To reduce costs and improve the safety of their Velocity® Expandable Interbody Device, Spine Wave partnered with OptiMIM to manufacture a complex shipping lock component using metal injection molding, resulting in a more cost-effective and reliable solution. 

Machining to MIM for Precision & Cost Savings

Compare investment casting and MIM for complex metal parts, highlighting differences in tolerances, costs, materials, and production scalability.

Investment Casting vs. Metal Injection Molding

Investment Casting vs. Metal Injection Molding: A process comparison

Gain a comprehensive understanding of metal injection molding and how OptiMIM delivers complex parts for diverse high-performance applications.

MIM Overview | OptiMIM Webinar

MIM Overview

Find out how design flexibility, material diversity, and production repeatability make MIM ideal for industries requiring performance-critical components.

Leveraging MIM for Performance | OptiMIM Webinar

Leveraging MIM for Performance

Discover the unique properties of MIM materials and how fine powder metallurgy achieves high-density, complex shapes in demanding industries.

Metal Injection Molding Materials | OptiMIM Webinar

MIM Materials

Hear OptiMIM experts answer common questions about MIM processes, design recommendations, material behavior, and production optimization.

MIM Experts Panel: FAQ | OptiMIM Webinar

MIM Experts Panel: FAQ

Explore how MIM allows multiple parts to be consolidated into a single component, improving product performance while reducing manufacturing steps.

Part Consolidation with MIM | OptiMIM Webinar

Shaping the Future: Part Consolidation with MIM

Understand what component geometries, materials, and tolerances make a project an ideal candidate for precision metal injection molding at OptiMIM

What's a Good Fit for MIM? | OptiMIM Webinar

What's a Good Fit for MIM?

See how MIM helps scale production of intricate parts, maintaining precision, repeatability, and cost control from prototype to mass volume.

Securing Scalability: Utilizing MIM to manufacture at scale

Gain expert insights from the OptiMIM round table discussion covering design challenges, material selection, and production scalability for MIM.

MIM Round Table | OptiMIM Webinar

MIM Round Table

Learn how specialty alloys expand the limits of MIM applications, enabling parts with exceptional durability, corrosion resistance, and strength.

Molding With MIM Specialty Alloys | OptiMIM Webinar

Molding Excellence With MIM Specialty Alloys

Download the The MIM Performance Dividend whitepaper from OptiMIM to explore innovative design strategies and advanced MIM manufacturing techniques.

The MIM Performance Dividend | OptiMIM Whitepaper

The MIM Performance Dividend

Learn how part consolidation through MIM simplifies assemblies, reduces production costs, and improves overall product durability and performance.

Value-Added Part Consolidation with MIM | OptiMIM Article

Value-Added Part Consolidation with MIM

See how OptiMIM enables cost-effective mass production of complex parts while maintaining precise tolerances and superior surface finishes.

Utilizing MIM to Manufacture at Scale | OptiMIM Article

Utilizing MIM to Manufacture at Scale

Discover how OptiMIM’s expertise supports medical device developers by producing MIM components that meet stringent FDA material and quality standards.

Streamlining FDA Approval With OptiMIM | OptiMIM Article

Streamlining FDA Approval With OptiMIM

Compare the benefits and trade-offs of MIM versus traditional CNC machining, including cost per part, complexity, and production scalability."

Metal Injection Molding Vs. Machining | OptiMIM Article

MIM Vs. Machining

Explore the critical debinding step in MIM, where binder removal ensures successful densification and dimensional precision during sintering.

MIM Series Part 5: Debinding | OptiMIM Article

MIM Series Part 5: Debinding

Understand how the sintering stage densifies MIM components, improving strength, dimensional accuracy, and final material properties.

MIM Process Series Part 6: Sintering | OptiMIM Article

MIM Process Series Part 6: Sintering

Learn how mixing metal powders with specialized binders creates the feedstock needed for precision injection molding in MIM manufacturing.

MIM Series Part 3: Compounding | OptiMIM Article

MIM Series Part 3: Compounding

Examine how carefully engineered feedstock determines the flowability, molding success, and ultimate strength of finished MIM components.

MIM Series Part 2: Feedstock | OptiMIM Article

MIM Series Part 2: Feedstock

Get answers to common questions about MIM processes, tolerances, materials, and cost advantages in OptiMIM’s metal injection molding FAQ resource.

Metal Injection Molding FAQ | OptiMIM Article

Metal Injection Molding FAQ

Discover the unique thermal expansion properties of Kovar alloy and why it's ideal for high-reliability electronic and aerospace applications.

Material Spotlight: Kovar | OptiMIM Article

Material Spotlight: Kovar

Compare MIM material choices against traditional manufacturing methods to understand trade-offs in strength, durability, and design flexibility.

Material Options - How Does MIM Compare? | OptiMIM Article

Material Options - How Does MIM Compare?

Explore the dimensional possibilities and material constraints when designing oversized components for production with metal injection molding.

How Large Can You Create a MIM Component? | OptiMIM Article

How Large Can You Create a MIM Component?

Learn how OptiMIM’s MIM processes support the use of FDA-compliant stainless steels for safe, durable, and corrosion-resistant components."

Food Grade Stainless Steel | OptiMIM Article 

Food Grade Stainless Steel

Explore how tailoring material properties in MIM unlocks new possibilities for miniaturization, weight reduction, and complex geometry formation.

Customizing Materials for Greater Design Freedom | OptiMIM

Customizing MIM Materials for Greater Design Freedom

Examine the key differences between MIM and powdered metal processes, including design capabilities, material properties, and cost efficiency.

Comparing Metal Injection Molding & Powdered Metallurgy

Meet the OptiMIM team and see how our engineering, materials expertise, and precision molding drive success in complex metal parts.

Introduction to OptiMIM | OptiMIM Video

Introduction to OptiMIM

Watch how metal powders are precision-molded into high-density parts through OptiMIM’s advanced multi-stage MIM production process.

Metal Injection Molding Process | OptiMIM Video

Metal Injection Molding Process

Explore the core principles of metal injection molding and how OptiMIM helps industries achieve scalable, repeatable high-performance components.

Metal Injection Molding Overview | OptiMIM Video

Metal Injection Molding Overview

Discover why MIM outperforms traditional manufacturing with design freedom, material strength, and cost-effective production at OptiMIM.

Benefits of Metal Injection Molding | OptiMIM Video

Benefits of Metal Injection Molding

Start your journey into MIM with an overview of powder metallurgy basics, material selection, and the critical phases of the MIM process flow.

Metal Injection Molding Overview Series | OptiMIM Article

MIM Series Part 1

See how precise injection molding of fine powders shapes complex geometries with tight tolerances before MIM parts are sintered.

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