The consumer 3D printing industry has seen huge cost reductions in filament-style printers over the past decade. But the performance of these machines has plateaued. This is partly because improvements in the extrusion deposition system have not kept up with other aspects of printer performance. Developed by the inventor of Ninjaflex, the Flexion (flek shuh n) Extruder provides many new features to address this problem. It is a highly-engineered flexible filament extruder capable of printing all of the most common materials: ABS, PLA, Nylon, Semiflex, Ninjaflex, and even ultra-flexible materials with durometers as low as 60 Shore A.

This is the most precise, effective, and absolutely gorgeous upgrade I have done to a printer so far.

Patrick Bishop

PB3D Creations

If you’re serious about taking your 3D printer to the next level, the Flexion Extruder is a no-brainer.



If you just want that ultimate flexible filament printing experience, then I can totally recommend the Flexion Extruder. It is high quality and well built, and works amazingly well even for the softest filaments.

Thomas Sanladerer

Tom's 3D

The Flexion line of products:


The Flexion Extruder is a highly-engineered, precision-machined flexible filament extruder upgrade for your desktop 3D printer. In addition to the higher quality and improved tolerances of the all-metal parts, there are a few specific benefits of the Flexion Extruder.

Ultra-flexible Filament

A fully-supported path between drive and hotend allows you to print filament down to 60 ShoreA (much more flexible than Ninjaflex)

High-speed Printing

Can print flexible filament at least twice as fast as the typical hacked extruder. 70mm/s with 0.4mm nozzle and 0.2mm layer height.

Self-cleaning Drive

A brush constantly clears the drive roller of plastic shavings, keeping the teeth sharp to drive filament consistently.

High-resolution prints

Higher pressure in the hotend lets you use nozzles with smaller orifices. A 0.2mm nozzle is included with every kit.


A lot of the frustrations you may experience while printing are caused by a low-quality extruder. Your stock extruder is not designed to print flexible filament. In fact, it’s not designed much at all. Here are a few of the main issues that the Flexion Extruder solves.

Poor Filament Support

Extruding elastomers is like pushing rope.  If there’s anywhere besides the barrel for the filament to go, it will.

Wrong Drive Compression

ABS requires a different degree of compression than Ninjaflex. The drive mechanism needs to be adjustable for each filament type.

Buildup on Drive Teeth

23 hours into your 24 hour ABS print and you start underextruding. Usually this is due to ground ABS filling the teeth of your drive roller.


What is it?

3D printers are amazing these days – the positioning system can produce astounding resolution and accuracy for a remarkably low price. But one area that has lagged behind this development is the extruder – until now. The Flexion Extruder is a flexible filament extruder which allows the full-speed printing of a wide variety of materials, including filaments that are more flexible than anything available on the market today. Flexion can also build up higher pressure in the nozzle – allowing a smaller nozzle orifice (included with every purchase) and higher resolution prints. Finally, a brush is constantly cleaning the extruder, preventing frustrating failures caused by clogged and frictionless drive teeth.

Why do I need it?
If the Flexion Extruder saves a single 12-hour print by keeping the drive gear clean, it is probably worth it. If it allows you to get the resolution on a print that you just can’t get with a 0.4mm nozzle, then it’s definitely worth it. But most of all, printing in flexible materials is great. No heated bed, no adhesion issues or warping, incredibly durable parts – for a lot of applications, flexible filament is preferable to rigid PLA or ABS parts. And the Flexion Extruder will allow easy and fast printing of any flexible filament – down to 60 Shore A durometer or lower.
What are the features?

Higher resolution. Fewer failures. Faster printing. Compatibility with low-durometer materials (not currently possible with any other extruder). This a fully-versatile flexible filament extruder. It can run Ninjaflex at full-speed.

What can't it do?

The extruder/hot-end combination is not designed for high-temperature extrusion. There is a PTFE tube going straight down to the nozzle, so we would not recommend running it over 240C. If you want to print hotter than that, we will soon have a high-temperature add-on kit that lets you go as hot as you want! (Expected mid-July)

Can I make one myself?

Maybe. There are some things you can do on your own to print flexible materials – namely, make sure the path from the drive gear to the nozzle is completely supported. The Flexion Extruder is precision-machined from metal components. The tolerances are carefully considered and allow you to achieve a speed, reliability, and longevity that is likely impossible with printed components.

Flexible filament extruder packaged

Do you own a printer that isn’t supported yet? You may be interested in our developer program. Receive a heavily discounted or free Flexion Extruder in exchange for developing and publishing an open-source adapter. Contact us for more details!