Prusa I3 Autorewind Spoolholder and Filamentguide - gravity works

thingiverse

Inspired by Vincent Groenhuis's "Sisyphus Auto-Rewind Spool Holder," I thought it would be much better to create a spool holder that works based on gravity as well. Assembly help: https://youtu.be/r2fYrUZqIkA The main issue this spool holder solves is the tangled filament on full spools during backwards filament transport. With this spoolholder, this will not happen anymore. Additionally, due to its position, it also solved the problem of not being able to use the full Z-axis of your Prusa printer. This spoolholder works with every spool I was able to get my hands on. The cones left and right fix the spool no matter what the inner diameter is. Even the "fat" Prusa spools are working, since you can adjust it to the width of the spool. Just print the bolt, lower clamp, and filament guide one time each, while printing all other parts two times. For assembly, you will need 4 screws that are M3x20mm in size. Mount the lower clamp and filament guide on the two shanks as shown in the picture. Mount it on top of your printer. Now put the bolt through the spool's hole. Secure it from both sides using the cones, with the flat side pointing away from the spool. Try to fix the spool centered on the bolt. Now add the gears left and right, with the flat side showing towards the spool. Add the nuts outside of each gear. Place the spool on top of your spool holder as shown in the pictures. Feed the filament through the hole of the filament guide into your extruder. Enjoy printing. I printed all parts using DasFilament.de PLA filament, with 2 perimeters, 4 on bottom and top. I used a layer thickness of 0.2 mm and 15% cubic infill, except for the bolt. The bolt was printed as described above, but I changed the perimeters to 4 and the infill to 50%. Changes: V2 I changed the shanks to use less filament, speed up print time, and avoid the noise when the gear leaves the teeth area of the shank