KvR's Compact Extruder with Direct Drive

by Printing-3D, published

KvR's Compact Extruder with Direct Drive by Printing-3D Apr 8, 2013

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Printed in ABS and bottom plate and motor ring glued together.
Spring, MK7 drive gear and 608ZZ bearing used to get the correct pressure on the filament. First tests with 1.75mm filament gives excellent grip.

Next step is duration testing. Keep you updated


Printed with ABS fill grade 0.9. Drawings made within sketchup, used slic3r to generate GCode. Used my Creatr printer to print the parts.

Parts are also available here

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Hi, I'm currently trying to adapt this to a new hot end I'm working on. Just curious as to how you're mounting the bearing. I don't see anything that serves as an axle anywhere.

I used a din 913 M4*16 bolt.
The printed hole I drilled to 3.2 mm and used an M4 thread drill.
Hope this helps! Otherwise, just let me know.

SU file for the bottomplate has been downloaded

I'd like to give it a try but will need to adapt it for my printer.
Would you accept to upload your SU file so I can work from there ?

Hi Anar,
I will upload the SU bottomplate later today

Nice design. I like how the filament is threaded into the extruder hole, which I consider to be the only serious flaw in the "Minimal Mk8." Do you know how the Mk7 form compares to the 8? Could this be adapted for a Replicator? I look forward to seing your duration results.

My experience with the Minimal Mk 8 leads me to suggest that if it works but then begins to slip, first look at cleaning the drive gear and then look at if your spring has lost tension. I ate through springs at first until I found exactly the right fit.

Adaptation to the replicator should be possible. Would also make sense for the duration testing on other machines. Will look into it.

For the slipping I am using those small 'teeth cleaning brushes' to keep the drive gear clean. Works great for me.