Bullfrog Extruder

thingiverse

A printable version of another famous extruder. (For Geared stepper) Bowden only for now. I used Formfutura HDglass blinded light grey. It’s strong and prints great. ABS should be okay, but there might be some shrinkage. Don’t use PLA. Print at 0.2mm layer height with 30 percent infill. No supports. There are two versions of the motor mount, the one with through hole is to hold the frame mount in place and requires a 25 to 30mm counter sink cap screw. The frame mount has got four holes so you can rotate it in 90 deg increments depending on you mounting orientation. There are three versions of the frame mount for M4, M5 and M6 holes, choose the one that you require. Tap a M4 thread into the bearing holder Tap M3 threads into the Motor mount and the frame mount You need to fit the frame mount onto the motor first, then follow the video for the assembly order. I have been using it on my Hypercube for almost 2 months now with no problems. It won’t work well with flexible filaments though. You will need the following: Nema 17 geared stepper motor 5:18 ratio Compression spring Height 19-20mm high Wire diameter 0.8mm Diameter outer 6.4mm Bearing 688ZZ Inner Diameter 8mm Outer Diameter 16mm Width 5mm Cap Screws 1x M4x10 Button Head 1x M4 thin washer (to hold the bearing inner race, must be thin or the cap screw will touch the cover plate) 4x M3x6 counter sink 1x M3x25 counter sink (or M3x30 to reach the extruder frame mount and hold it in position) Bowden Connector 1x M6 hose connector https://youtu.be/DxRU-pn2-B4