No fuzz 1.75mm Nema 17 extruder

by Kulitorum, published

No fuzz 1.75mm Nema 17 extruder by Kulitorum Mar 12, 2013
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Most basic but very well working extruder. One piece with a Mk7 drive gear and a idler bearing.
it's solid, it's simple and it just works.


Print the part, mount a 624 idler bearing (4x13x5) with a M4 screw.

Mount the motor with the Mk7 drive gear and adjust the position of the motor to adjust the tension on the filament. You want it to make clearly visible indentations in the filament.

Mount on standard 50mm carriage.

Never look back.

The part is modeled in SpaceClaim, but I have added all the CAD formats I could export, so everybody should be able to modify it.

See it in action here:

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Works very well even without a bearing!!!!

It is designed in milimeters (mm) and should be printed as such.


Question: Does anyone know about a scaling problem with this part?

Printed it on modded Printrbot and Repetier Host with Slic3r and it is WAY too small.
I like this model and would like to use it on an upcoming printer build.


May I kiss whoever designed this, because they had the good sense to design it in Rhino.

Thanks :)

But it was designed in SpaceClaim, and files exported in all sorts of formats. Glad you like it though.

Please, if you try this, post a pic, and lets hear how it works out for you.

What you may fail to realize is that the filament is squeezed inbetween the idler bearing and the drive gear very tightly, because the motor is mounted so that the space between the two is something like 1.2mm, so the squeeze is very tight.

So there is a way to keep the bearing tight against the filament, its just not limited by some flimsy spring loaded construction.

It works perfect. I even linked 3 videos where you can see it print steady and well at 125mm/sec.

i have not printed this ,, but no way to keep the bearing tight against the filament doesn't seem like a good idea to me... have you actually tried this? does it work reliably ?