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NEMA 23/MK8 bowden Extruder - "Kraftwerk" Basic Version

by toolson, published

NEMA 23/MK8 bowden Extruder - "Kraftwerk" Basic Version by toolson Jul 16, 2015
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Summary

You have a big size printer and are looking for really strong bowden extruder? Then this one will suit you.

This is the first extruder of my extruder series. More upgraded versions will be released in the next few month.

modified version with filament-tracking-system:
http://www.thingiverse.com/thing:955370

The extruder is designed for use with 1.75mm filament.

Important: You need a NEMA 23 stepper with 5mm shaft! Usually they have 6.5 mm shaft. My rotor/shaft is edited on a lathe.

The extruder is designed to work with the great MK8 drive pully.

BOM:
4 pcs - nut DIN934 M5
1 pcs - nut DIN934 M4
3 pcs - screw DIN912 M5x16
1 pcs - screw DIN912 M5x35
1 pcs - screw DIN912 M4x30
1 pcs - round steel dia 6mm, 12mm
2 pcs - bearing 684ZZ
1 pcs - bearing 626ZZ
1 pcs - spring (standard print bed spring)
1 pcs - eye screw DIN444 M5x40
1 pcs - nut DIN466 M5
2 pcs - push fits M5 (4mm tube)
1 pcs - MK8 drive gear
1 pcs - NEMA 23 stepper (5mm shaft!!)
and finally: both printed parts

Please share your makes!

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Hey Lars, great design! Would like to use it on my d-bot as i have a few spare 23s but dont have a lathe... Managed to find a 6.35mm MK7 drive gear though, any chance you could make a version that would work with the larger MK7 please?

I lost the source file for this a year ago.

But somewhere must be my V2 version of this.

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