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SnakeBite extruder for 3mm 3D printing filament

by the_digital_dentist, published

SnakeBite extruder for 3mm 3D printing filament by the_digital_dentist Mar 1, 2014
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4346Views 616Downloads Found in 3D Printer Extruders

Summary

This is an experimental, high mechanical force 3mm filament driver to push the filament into the hot-end of a 3D printer. It uses counter-rotating 6-32 nuts to drive the filament.
Video of operation here:
http://vimeo.com/87940579
Update: IT WORKS! It will need some tweaking...
http://vimeo.com/89471876
http://vimeo.com/89471877
Here it is on a large print: http://vimeo.com/89872411

Instructions

Printed on MegaMax with 0.35mm nozzle, coex3D green ABS filament, first layer 0.35mm, remaining layers 0.2mm, no support material, 30% infill, 2 top and bottom layers, 2 perimeters.

Use NEMA-17 motor, 6-32 screws to hold cover on base, 8-32 screws to mount on printer carriage, M3 screws to motor.

One filament drive nut is left hand threaded, made by tapping mild steel with a left hand tap, the other is standard 6-32 nut. Make sure the nuts thread onto 3mm filament- some start with larger holes and will slip right over the filament.

Both nuts are soldered to 5mm ODx 0.45mm wall brass tubing. 625Z bearings (5x16x5mm) are pushed onto tubing. Gears come from American Science and Surplus or ebay, also pushed onto tubing.

Gears: http://www.sciplus.com/p/PLASTIC-GEAR-SET-WITH-BUSHINGS_40234

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