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NEMA 17 bowden extruder drive

by jmgiacalone, published

NEMA 17 bowden extruder drive by jmgiacalone Jan 22, 2011
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Summary

Based on Wade's extruder, with the X carriage mounting holes removed since this will be mounted on the Huxley frame instead. Also includes some other changes to take the bowden tube (3mm OD) and work with a 1.75mm diameter filament, driven by an M4 toothed brass insert.

The gears are 9 and 53 tooth gears respectively, giving a ratio of nearly 5.9:1. I might try using a NEMA14 instead in future since the force required to push 1.75mm filament through the nozzle is a lot less than 3mm filament.

The huxley_gears.scad file uses Greg Frost's involute gear script http://www.thingiverse.com/thing:3575

I'm not totally happy with how this mounts onto the frame yet, but it's useable (with a few zip ties) and running on my eMAKER Huxley prototype machine.

Instructions

You will need the following vitamins:
4x M3x10 Socket Head screw
4x M3 washer
1x M3x10 Grub screw
5x M4 nut
4x M4x40 Screw
1x M4x60 Screw
1x M4 toothed insert
Handful of M4 washers
1x NEMA17 hybrid stepper motor

Print all parts and assemble as per the photos, (similar to a standard Wade's extruder drive). I printed the gears with a 0.5mm nozzle on an UP printer and they came out really well.

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GNU - GPL
NEMA 17 bowden extruder drive by jmgiacalone is licensed under the GNU - GPL license.

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PTFE tubing can be had at reprapdiscountDOTcom and filastruderDOTcom

PTFE tubing can be had at reprapdiscountDOTcom and filastruderDOTcom

how do you secure your pneumatic fitting? i cuently have a difrent moddel laying around. have you got some mesurments to compaire?

i want to make shure my fitting fits the printed hole, and i have some clearence for a nut.

The bowden tubing is 3mm OD PTFE tube, secured at each end with a Camozzi Pneumatic fitting.

The body was modelled in Solidworks, I can upload that if it's any help. Or convert it to another format, just let me know.

Do you know exactly which Camozzi fitting that is and where I could get a handfull? I am trying to upgrade from the brass fittings which screw into a PTFE tube on my RepRapPro Huxley, fitting it is a right faf and the tube keeps popping off. Thanks! Where do you get your PTFE tube also? Sorry for newbie questions.

Hello,

We changed from the Camozzi fittings to custom brass ones for the simple reason that the new fittings have a much better grip on the tube. Changing back to the pneumatic fittings will not solve your problem, and will likely make it worse.
Your issue is more likely related to a (partial) blockage i
nside the melt chamber. For help on this see here http://reprap.org/wiki/RepRapPro_Huxley_troubleshooting#Machine_stops_extrudinghttp://reprap.org/wiki/RepRapP...

Could you upload your scad file for the body? I am trying to make a greg's acessible bowden.

What tubing are you using for you bowden and how are you coupling it?

Is it possible to get a description of the toothed insert, and some pictures of the inside of the build please, i cant seem to work out how the filament is gripped onto the part.

thanks

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