Protospace Extruder

In the group at Protospace (FabLab Utrecht, the Netherlands) we designed and built a new extruder. Most of the design work was done by Robert, and a very good result was obtained with the first build. It could be changed to be slightly easier to build, but it’s just an afternoon’s work (when done for the first time). Click on the images to see a gallery with build details.

The whole assembly. Design by Robert, ideas and live testing by Siert and Erik.


Obviously we intend to share the design files. They are currently spread across multiple people’s computers, so please give us some time to post it (probably on Thingyverse).

As a pinching pulley I used this component:
INZETSTUK M5 (Conrad Electronic)
What you see is not what you get (the distributor’s picture is different), it actually is better for our purposes:

What I actually got when ordering the part with ordering code 226521 – 89 at

Bill of materials:

  • 7 M3 x 30mm bolts
  • 2 x M3 x 35 mm bolt (for fitting the compression spring to push against the pressure wheel’s axis)
  • 10 M3 nuts (preferably locking nuts)
  • 3 x 25 mm piece of Rod (diameter 8 mm, best without thread).

Dit vind je misschien ook leuk...

5 reacties

  1. Batist schreef:

    Nice! Do you use a pulley for this? (for taking the plastic wire?)

  2. I decided to print a chess piece. I was amazed by the quality. I really love the new extruder we designed and built at protospace Utrecht.

    The two chess pieces!

  3. Stephen George schreef:

    Looks good. Can’t wait to see the STL files.


    • Erik schreef:

      It’s a 2D vector based design. We’ve already created several new iterations. I’ll see if I can get my friend Siert to publish a recent one on Thingiverse!

  4. Luca Dinale schreef:

    I’m designing and building a plexy-Mendel.
    Can you help me a bit about extruder?

    I want to keep it simple and use Bowden cable with nema17 motor.
    Any suggestion?
    I checked Nophead and Wade extruder, but now i’m a bit in confusion.
    Do you have some simple design to start with?
    I can use a laser cutter.
    Thanks in advance, Luca