Palatis FricEx (belt driven friction extruder cold-end) (1.75mm filament) by palatis

Last crawled date: 4 years, 3 months ago

An extruder code-end inspired by Gunstruder (https://www.thingiverse.com/thing:1247952).
I basically designed this to avoid griding into the filament.
Bill of Material:
172mm (86t) closed-loop GT2 Timing Belt x 1
GT2 16T pulley (D13 * 14mm, 5mm bore) x 3
NEMA17 stepper motor (5mm shaft) x 1
D5 x 25mm shaft x 3
F685 (ZZ/2RS) bearing x 4
MF105 (ZZ/2RS) bearing x 2
M3 square nut x 4
sunken head M3 30mm x 3
sunken head M3 10mm x 1
sunken head M3 25mm x 2
M3 20mm x 2 (for pulley tension adjustment, any M3 longer than 20mm will work)
4mm PTFE pipe fitting (M6 threads) x 1 or 2
For mounting the cold-end to 2020 aluminum extrusion, you will need:
sunken head M3 30mm x 2
M3 T-nut x 2
or duct tape / superglue...
Assembly:
insert the 2 MF105 into the filament idler pulley
insert the 4 F685 into the top / bottom casing
Insert the square nuts into the square holes
Install the 16t belt pulley on the motor
install the 2 16t idler pulley on and the belt, arrange them in a triangular shape
screw everything together
adjust the tension of filement idler pulley
Extruder steps/mm example:
stepper steps per revolution * microstepping / (stepper pulley teeth * belt pitch)
= 200 (1.8deg) * 16 (microstepping) / (16 (teeth) * 2 (gt2 2mm))
= 100 steps / mm
however, always calibrate E-steps/mm for your printer.