3D Printed Footwear: Flexible Filaments and the Factor 4

3D printed footwear is moving from concept to commercial production, and a Barcelona lab is leading the shift. Footwearology, an innovation lab and academy, uses flexible filaments and the UltiMaker Factor 4 to make shoes that are custom, recyclable and built on demand. Its work shows how footwear manufacturing changes when 3D printing replaces moulds and mass production.

This case study looks at how Footwearology produces 3D printed footwear, why it chose FDM and TPU, and what the model means for Australian makers.

3D printed footwear at Footwearology

Footwearology is more than a brand. It is a research, consulting and education lab in Barcelona, Spain. Its goal is to reshape how the footwear industry works, and it equips designers and makers to adopt modern production methods.

Sustainability sits at the centre of that mission. Footwearology connects technology providers, designers and digital platforms to build a local, custom production model. This cuts waste and transport emissions, and it supports footwear made for each wearer.

Why FDM and flexible filaments suit footwear

The lab treats 3D printing as a full production technology, not a prototyping tool. The team picked Fused Deposition Modelling, or FDM, as the best fit. It is scalable, adaptable and uses material efficiently.

The reasoning is practical, as the CEO explains:

"FDM allows for affordable production and better sustainability compared to powder or resin-based methods, especially for flexible items. Our materials can be fully recycled or compostable, which is important for us." - Nicoline Van Enter, CEO.

Flexible filaments make footwear viable on an FDM machine. They print the soft, springy parts a shoe needs, from midsoles to uppers, in one process.

TPU: the flexible filament behind the shoe

Thermoplastic polyurethane, or TPU, is the core material in Footwearology's strategy. UltiMaker TPU 95A is durable, flexible and recyclable, which makes it well suited to footwear. The team builds parts with variable stiffness and cushioning. It tunes support to a wearer's body weight or gait.

Footwearology works with material maker Recreus to produce custom TPU colours. These filaments offer varied properties, weights and densities, which widens the design options for each shoe. The team favours recyclable TPUs and is testing compostable options. The finished products stay wearable and responsible.

How the UltiMaker Factor 4 prints a whole shoe

The UltiMaker Factor 4 is the industrial FDM printer at the heart of the operation. After years modifying machines for flexible materials, the team settled on the Factor 4 as its platform.

Several features matter for soft filaments. The enclosed build chamber and steady thermal control hold print quality across long runs. The dual gripper direct drive system shortens the filament path. It reduces the clogging and deformation common with soft TPU. Dual extrusion then lets the printer combine materials in one part.

That multi-material option is what makes a complete shoe possible:

"Thanks to its multi-material printing option for flexible materials, we can print an entire shoe using the Factor 4."

Software ties the workflow together. UltiMaker Digital Factory manages print profiles across several machines. It helps Footwearology scale output while controlling material use, quality and speed. The same printer serves other sectors too, as our automotive 3D printing applications guide shows.

"Another reason we want to keep working with UltiMaker is Digital Factory. The software integrates seamlessly with our workflow," says Nicoline

Decentralised production and what it means for Australia

Footwearology builds toward a decentralised "network production" model. Regional hubs print custom footwear at scale, close to the wearer. The approach lowers material waste, transport emissions and inventory costs. It tailors each pair to the wearer's biomechanical profile.

On-demand production replaces large pre-made runs, so a shoe is made only when ordered. Ease of use keeps the model practical day to day:

"We've always valued how easy UltiMaker is to use - especially how effortlessly the print core can be changed."

Australian makers have the same building blocks locally. A Factor 4 running TPU 95A lets footwear brands, podiatry labs and designers make custom, low-waste parts in-house. There is no need to ship work offshore. Australian 3D Printers supplies the Factor 4 and UltiMaker materials with local support.

Frequently asked questions

What is 3D printed footwear?

3D printed footwear is shoes and shoe parts made by additive manufacturing instead of moulds. Designers print midsoles, uppers and full shoes straight from a digital file. The method supports custom fit, low-volume runs and recyclable materials.

Which material is used for 3D printed footwear?

Flexible filaments, mainly TPU, make 3D printed footwear possible. UltiMaker TPU 95A offers the durability, flexibility and recyclability that shoes need. The team tunes its stiffness and cushioning to a wearer's weight and gait, which makes it ideal for custom footwear.

Can you 3D print a whole shoe?

Yes. Footwearology prints an entire shoe on the UltiMaker Factor 4 using its multi-material option for flexible filaments. Dual extrusion combines soft and firm sections in one part, so a complete shoe comes off the printer with less assembly.

Why use the UltiMaker Factor 4 for footwear?

The UltiMaker Factor 4 suits footwear because its enclosed chamber, stable thermal control and dual direct drive extrusion handle soft TPU well. The short filament path reduces clogging and deformation, and multi-material printing allows a full shoe in one build.

Where can Australian businesses buy a footwear 3D printer?

Australian businesses buy the UltiMaker Factor 4 and TPU 95A through Australian 3D Printers, the local authorised reseller. The team advises on the right printer and flexible filaments for footwear, with local support and supply.

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