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Ultimaker extruder update

by ghagen01, published

Ultimaker extruder update by ghagen01 Jan 14, 2012
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I finally made a re-design of the extruder assembly of a Beta
The design was on my mind for a long time.
The advance is the bigger diameter off the "bolt" (20 mm) and a bearing as a pressure roller.
Also the wheel has just straight grooves so I don't have to clean it anymore.
Because the grooves are straight it's not grinding in the filament
I print for many hours without cleaning.
My parts are looking better also because of the constant transit of
the filament.

The only disadvantage is that you have to make some parts in steel.

Geo Hagen


Print part and assemble.
Some parts must be mirrored.

The parts 50materialwheel and 50pin-M4 are made of steel.
I use the standard bearings of the Ultimaker 8x16x5 mm.

For the tube I use a standard fitting of Festo.
G1/8 with 6 mm hole.
You have to tap this thread in 50 fittingblock.

Before you print you have to change some settings in the software because of the larger wheel.

With skeinforge >40 set M92 to about 315.
With skeinforge<40 set Flowrate to about 17 when using feedrate 60.

There is also a Solidworks 2012 zipfile with all the parts.

Please comment when things are not clear or wrong.

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Thank you for including the files from SolidWorks!

Looks nice ! Maybe you should mark it as a derivative of this thing, to help people find it.

I was notified someone ordered the 2 metal parts that I uploaded to shapeways.

Some warnings/hints :

  • 50materialwheel's shaft is not threaded, so you'll have to hack another way to attach the large extruder gear to it. I printed a plastic gear (see derived thing 25914) and drilled a little bump on the shaft to force the gear rotating with the shaft.
  • 50pin-M4 also isn't th
    readed, and being steel it's difficult to do manually - I broke a tap in its hole and had to use a printed plastic version instead, converted to M3.
  • As printed by shapeways in steel, the parts are a bit fat, you'll have to use a file on the shaft of 50materialwheel to have the bearings fit.
  • The
    change in reduction ratio make that extruder a bit less powerfull than the original one, you might have to decrease your print speed.

Also when your original ultimaker extruder is slipping, it might be that your hotend is blocking, I still have this problem that it prints fine on the first half of
an object and begins to block after a while. Looking for fixes currently (maybe a fan blowing on the peek part would help).

Hope it helps whoever wants to build that.

My printer isnt even consistent enough to print these parts

Could someone here print them for me ? In exchange for postage and a little extra, let me know .. Im dying to make my printer worthwhile !

At the moment it is screwing up almost every print no matter what i try DONT_KNOW

Hey Geo... I adapted the Owen bowen retention mechanism to your extruder.


thanks for the great design!


Ultimaker ghagen01 Owen fitting block

mine just melted due to the hot environment and a bit too hot extruder stepper motor. i think I want a fully cnc-produced extruder...

For reference and verification before I buy those, the bearing are 688 (8x16x5 mm) and you need 3 of them, right ?

amp; Yes! :)


I just wanted to note that a minor improvement could be done. Since the extruder is not grinding anymore, its not necessary to have it open at the sides. The opening at the sides make it difficult to insert new materials, i.e. doing filament changes on the fly by pushing in a new one. Its quite possible that it will move sidewards as there is no real side stabilization.

I will make an update when I have time.

I made also a gearwheel for the wooden stock part.

Not tested yet, but it should have a better teeth form compared with the stock wheel.(less play)

I use retraction since a few days and i hear a lot of noise coming from the combination stock gear wheels.

Geo Hagen

i just made a remix, which does that.

What feeder rate should be used for this?

Can I use the existing bowden tube clamp with your extruder?


You can use anything as long as it has a 1/8 G thread on it.
As far as i know the stock tube clamp has 1/8G thread.
Look at picture left of this page at I made one.



So, this would work, right?


Also, might be a silly question, but what tool do I need "to tap this thread in 50 fittingblock"?


I can't see the product on website because need to login.
But you need a 1/8G tap to make the thread.
Maybe you have a connection at a toolshop or plumber?
They can help you.


Ok. I tried using sketchup for the first time today and hacked a solution for now that fuses this bowden clamp (http://www.thingiverse.com/thing:17027)http://www.thingiverse.com/thi... to your fitting block (as seen in the image) - thus printing it as one piece . Waiting for the metal parts to arrive to test this..

Bowden Clamp for Ultimaker (Feeder End)
by pit3k

It looks interesting but quite fragile too :S

I think so too Antiklesys :) ..i'll get around to buying a metal fitting when it breaks

One month using it and it is working great so far!

No more slipping... Thanks!! :D

Which settings do I have to change in Netfabb when purchasing the metal parts from http://fabberworld.comfabberworld.com ?

I know how to set a custom header, but I don't know what settings to change.


On tabpage Style you have an option calibrate.
Click on calibrate and you can set the extruder rpm for each combination defined in your material.
Example: for width 0.6mm, speed 45 mm/s, layer thickness 0.25mm i have a rpm of 1.25.
I made a build style for a testpart with only 1 outer contour.
his outer contour I set to width: medium (0.6 mm), medium(45mm/s) and my material had a layer thickness of 0.25 mm.
Than you print that part and mesure the wall thickness.
This value you can enter under button "enter measurement" in calibrate page.

Hope I am clear but once you get it it is easy to

Do you have a link to the exact Festo part used? I've been googling for a supplier but I'm not sure if I found the right series...


The partnumber is 153002 qs-1/8-6.
You can find it on the website of Festo.
But i think any brand will fit.


Minor update,

I put a spacer at the downloads.
I noticed that there was a small spacer needed between bearing and the big standard wooden wheel.
You can print it (maybe to small) or Tristan can add it to his set.
Because of the spacer a made the bearing through hole of the 50extruderrev1.stl larger.




Great job.
I send you a PM.



The metal parts for the new Ultimaker Extruder Update from Geo Hagen are in Stock now!


Both parts are CNC Turned, with the highest tolerances, Made in Switzerland:

  • Wheel, made in Aluminium, gear including M8 thread
  • The Axis in steel with a 3.2 mm hole

You can order the full Kit including the 688 2RS (8/16/5 mm) standard Ultimaker bearing for € 59.- plus shipping. Please ask for shipping costs!

If you have any questions, please email me: [email protected]



Ultimaker extruder update

Enter the GCode Header in Netfabb:

  • Go to "Ulitmaker" in the Project-Tree on the right
  • select the last Tab "Machine" (I translate the german tags, so the english version could vary a bit;-)
  • "Machine-Type" should be "Ultimaker" and here at the right of "Ultimaker" hit the button with 3 dots "..."
  • A Dialog opens -
    gt; select the "Ultimaker specific"-Tab and you see "GCode Header" and "GCode Footer"


Great idea! I have many problems with the extruder motor slipping the filament or grinding it.. very difficult to adjust.

However, I might have the same problem.. how to fix it for Netfabb?... I didn't find any constant related to the bolt diameter.. :S

Any information about it would be great.. and also, how to make the steel parts?
Any online steel service?


I dont use Netfabb (yet).
I tried the demo version and when I tried the calibration ÃÂ&#141; could lower the rpm of the extruder motor.
Also in the expert settings you can change the speed of the extruder.
Correct me if I'am wrong.


great idea.

i thought about something similar.

what is necessary for netfabb to get wit work right?
i mean where do i find the diameter for the extruder