Micah Chaban founded RapidMade in 2011 with a simple but ambitious goal: to help companies manufacture better products, faster and more affordably, by leveraging additive manufacturing and advanced tooling. It started with industrial 3D printing, and over the years, it’s expanded into a hybrid approach—combining the best of 3D printing, CNC machining, injection molding, and composites. Now, they provide everything from rapid prototyping to full-scale production, specializing in freeform injection molding (FIM), metal printing, and custom manufacturing solutions.
The following cover’s Micah’s insights on melding 3D printing and injection molding into a single service that provides the best of both worlds: Freeform Injection Molding.
What is Freeform Injection Molding (FIM), and why is it such a game-changer?
Freeform Injection Molding (FIM) is an advanced manufacturing technique that merges two traditionally separate processes: 3D printing and injection molding. The basic idea is that instead of machining metal molds—which is expensive, time-consuming, and limits design complexity—we use high-resolution, 3D-printed molds. These molds allow for rapid iteration, lower tooling costs, and the ability to produce geometries that would be impossible with conventional methods.
FIM is especially useful for prototyping, small-batch production, and highly customized components. Instead of waiting weeks or months for a metal mold to be machined, we can print a mold in a matter of hours or days. That means companies can test new designs faster, bring products to market more quickly, and make adjustments on the fly without enormous cost penalties.
How does FIM compare to traditional injection molding in terms of cost and performance?
If you look at traditional injection molding, the biggest expense is the tooling. A steel mold can cost anywhere from $10,000 to $100,000 or more, depending on complexity, and it takes weeks or months to manufacture. That’s fine if you’re making millions of parts, but for small production runs, it’s a massive barrier to entry.
With FIM, we can cut tooling costs by an order of magnitude. A 3D-printed mold might cost a few hundred to a few thousand dollars, and it can be produced in a fraction of the time. That makes injection molding viable for low-volume production, bridge manufacturing, and functional testing.
Performance-wise, FIM molds don’t last as long as metal ones. A typical 3D-printed mold might last for dozens or hundreds of shots, whereas a steel mold can run for millions. But for prototyping or short production runs, that’s often all you need. And because the mold is digitally fabricated, you can modify it easily without major retooling costs.
What materials can be used with Freeform Injection Molding?
FIM is compatible with a wide range of materials, including thermoplastics, elastomers, and even powdered feedstocks for metal and ceramic injection molding. The key is selecting the right 3D printing material for the mold itself.
For thermoplastics like ABS, PC, and nylon, we typically use high-strength photopolymer resins that can withstand the heat and pressure of injection molding. For elastomers, we often use molds with a flexible release mechanism to prevent tearing.
One of the most exciting areas of development is applying FIM to Metal Injection Molding (MIM) and Ceramic Injection Molding (CIM). Instead of sintering metal molds, we can print them directly, inject a metal or ceramic powder-polymer mixture, and then debind and sinter the part. That allows us to produce complex metal components with much lower tooling costs than traditional MIM processes.
What are the key challenges in designing 3D-printed molds for FIM?
The biggest challenge is balancing printability, durability, and moldability. Unlike metal molds, which can withstand extreme pressures and temperatures, 3D-printed molds are inherently weaker and more sensitive to heat. That means we have to carefully optimize wall thickness, venting, and cooling strategies.
One common issue is shrinkage compensation. Injection-molded plastics shrink as they cool, and 3D-printed molds behave differently than machined ones. We use a combination of simulation, empirical testing, and experience to determine the right scale factor for each material.
Another challenge is mold release. Traditional molds rely on draft angles to allow parts to eject smoothly, but with dissolvable FIM molds, we can minimize draft angles to maintain geometric accuracy. However, if we’re using reusable printed molds, we have to incorporate slip agents or strategic parting lines to ensure clean release.
How does 3D printing impact the future of tooling and manufacturing?
Additive manufacturing has completely changed how we think about tooling. In the past, molds were a massive investment, so companies had to be 100% sure about a design before committing to production. Now, we can iterate on molds rapidly and affordably, which encourages innovation.
The biggest shift is towards hybrid manufacturing. Instead of choosing between traditional and additive processes, we can combine them strategically. For example, we might 3D print a mold but reinforce it with a CNC-machined metal insert in high-stress areas. Or we might use printed tooling to create composite layups for aerospace components.
In the long term, I think we’ll see AI-driven mold optimization, where software automatically generates the best mold design based on material properties and production requirements. We’re already experimenting with generative design for injection molds, and the results are promising.
What industries benefit the most from FIM and advanced additive manufacturing?
Medical devices, aerospace, automotive, and consumer electronics are some of the biggest adopters. Any industry that needs rapid prototyping, low-volume production, or highly customized parts can benefit from FIM.
Medical device companies, for example, use FIM to test biocompatible injection-molded components before committing to full-scale production. Aerospace manufacturers use it to create lightweight, complex components that wouldn’t be possible with traditional machining.
Consumer product companies love FIM because it allows them to test market reactions before investing in full production. Instead of spending tens of thousands on a metal mold for a new product, they can print a mold, run a few hundred parts, and gauge demand before scaling up.
What’s next for RapidMade?
We’re constantly expanding our capabilities in hybrid manufacturing, focusing on making advanced processes more accessible to companies of all sizes. Our goal is to continue pushing the boundaries of what’s possible with digital manufacturing—whether that’s improving FIM, refining metal 3D printing, or integrating AI into the design process.
Right now, we’re working on new materials for printed molds that can handle higher temperatures and pressures, as well as refining our techniques for metal and ceramic injection molding. We’re also developing automated post-processing solutions to streamline production even further.
Ultimately, we want to make custom manufacturing as fast, flexible, and cost-effective as possible. The more we can reduce barriers to innovation, the more companies can bring their best ideas to life.
How can companies get started with FIM and RapidMade’s services?
The best way to start is by reaching out to us with your project details. Whether you need a prototype, a small production run, or a full-scale manufacturing solution, we can help optimize your design for Freeform Injection Molding or other advanced processes.
Visit us at RapidMade.com or email us at [email protected] to discuss your manufacturing needs. We’re always happy to explore new challenges and help companies bring their ideas to reality.
