SnakeBite extruder for 3mm 3D printing filament
by the_digital_dentist, published
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:
Update: IT WORKS! It will need some tweaking...
Here it is on a large print: http://vimeo.com/89872411
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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.