Custom orthotics and prosthetics with 3D printing

Custom orthotics and prosthetics with 3D printing

Patients receive improved orthotics and prosthetics thanks to additive manufacturing.

Additive manufacturing is transforming orthotic and prosthetic manufacturing from a costly and manual operation into a streamlined digital process. It enables, ProReva, a Dutch orthotic and prosthetic supplier, to provide better fitting, durable products, produced faster and at a lower cost.

“Through the partnership between Covestro, Twikit, Ultimaker and ourselves, I am convinced that patients will get high-quality, customized orthotic and prosthetic products that fit accurately and improve patient care. By digitizing orthotic and prosthetic manufacturing we can help more patients, reduce costs, make production fast and efficient, be less reliant on hard-to-find skills and get it right the first time.”

- Arjan Kremer, Finance & ICT Manager, ProReva


  • Labor-intensive, manual orthotic and prosthetic manufacturing
  • Reliance on off-site, highly skilled technicians
  • Demand for complex, costly orthotic and prosthetic products 


  • ProReva, Twikit, Ultimaker and Covestro partner to provide comprehensive digital workflow for 3D printed orthotics and prosthetics
  • Switch from traditional to digital manufacturing
  • Technology: Fused filament fabrication/Fused deposition modeling
  • Covestro Materials: Addigy® F1030 CF10 for the structural part of the device, in combination with Addigy® F2045 for the inner, softer part that touches the skin



  • Patients receive custom, high-performance orthotics or prosthetic devices
  • Production costs cut by 30%
  • Production time cut by 25%, so patients receive devices faster
  • On-site production with some items produced in hours
  • End-to-end streamlined manufacturing workflow


Needing an orthotic or prosthetic product likely means a labor-intensive, time-consuming and messy process. It usually involves wet-casting plaster, manual modeling and several fittings. For manufacturers, producing well-fitting orthotic and prosthetic devices is expensive and requires highly skilled staff.

Some products are available at a standard cost, but around 75 percent are customized and cost up to €1,000 each to produce. Faced with growing demand for more complex products, though with less funding, healthcare providers are under pressure to make orthotic and prosthetic production more efficient.

These issues were all too familiar to ProReva, a leading orthotic and prosthetic manufacturer and member of Bewegingsvisie, a group of organizations in the Netherlands dedicated to improving orthotic and prosthetic care.

Arjan Kremer, Finance & ICT Manager at ProReva, says, “How do we, or anyone in orthotic and prosthetic healthcare, manage increasing demand but still maintain standards and improve quality with tighter budgets?”



As Covestro investigated how additive manufacturing might help improve orthotic and prosthetic production, the team quickly realized it needed help from several partners to develop a comprehensive digital workflow solution, helping ProReva switch from traditional to full digital production of orthotics and prosthetics.

That integrated process starts with ProReva who works with healthcare providers to assess needs and electronically scan a patient’s injured limb to capture measurements and features needed for 3D printing. Software company Twikit has developed an application, TwikFit®, that translates scan data and patient needs to production-ready CAD files.

Twikit founder and CEO Martijn Joris says, “The TwikFit® cloud-based SaaS application bridges the gap between patient and product manufacture, cutting out several manual steps. The software integrates product design and engineering expertise with a user-friendly interface. It removes the complexity of CAD and allows non-technical orthotic and prosthetic professionals to maximize skills to customize and build high-quality digital models that are production ready.”

Devices designed using TwikFit® are printed with Covestro filament materials on Ultimaker 3D printers. Peter Overgaauw, Ultimaker’s Lead Application Engineer says, “The Ultimaker 3D printer portfolio can be scaled easily to produce different types and sizes of product and runs Covestro filament materials that are available on the market.”

From Covestro’s filament portfolio, the team selected Addigy® F1030 CF10, a strong and stiff material ideal for structural build, in combination with Addigy® F2045, a soft and flexible, though resistant material. This is ideal for the inner, softer part of the device that touches the skin as it passed relevant regulatory approvals for irritation and cytotoxicity.


The result of the collaboration between ProReva, Twikit, Ultimaker and Covestro is a comprehensive digital solution, enabling practitioners to offer better, faster care and provide custom, personalized orthotic and prosthetic devices to patients.

Patients can expect less of a wait to receive their device, fewer fittings and enhanced durability. The personalized orthotic and prosthetic items give patients better comfort and fit, resulting in improved healing time.

Switching to digital manufacturing removed several steps required in traditional manufacturing, reducing production time from two weeks to three days, as well as cutting costs by up to 30 percent. Some products can even be produced the same day as initial consultation. Orthotic and prosthetic manufacturers will be less reliant on expensive and scarce skills because features such as the easy-to-use TwikFit® application automates many modeling steps.

Digital manufacturing also replaces messy casting processes and provides a cleaner environment for staff. The variety and scope of Ultimaker printers and Covestro materials means the solution can be applied to a wide range of orthotic and prosthetic product types and production environments.

This orthotic and prosthetic ecosystem demonstrates how Covestro forms partnerships to accelerate the adoption of additive manufacturing by creating comprehensive solutions that benefit customers and, in this case, improve patient care.

How can we help?

Get in touch with our experts to discuss how Covestro can help you tap into the full potential of additive manufacturing.