Prusa i3 mk2 Spool Holder & Filament Guide

thingiverse

The original design spool holder functions well, but with certain rolls I couldn't get it to work without risking the roll falling off. So, I designed this one from the measurements I took of the frame and the original holder. The fit between the bar and the sides is pretty good - the printer did an awesome job: the squares are 10x10mm in Fusion 360 - measured after the print: 10x10mm with play of 0.01-0.06mm - this is what I call accurate. The bar fits quite strong on the sides - but after some uses it will get easier to remove it. The surface could take some finishing with epoxy to be smoother so that the rolls will roll easier on it - or you just leave it and wait till the wear out by themselves. UPDATE: I didn't want my 2.3 kg Spools (around 5 pounds) to sit on top of the printer frame. They also needed a bar with like 140mm. Solution: Make two side pieces with two bottom bars to keep it standing and use a longer top bar for the spool. As those are all from the same simple values you can make a bunch and adjust to your needs. For larger Spools you can use the mounting on top of the printer and the longer bar (140mm) or make two side pieces and use the 80mm bars for a narrow free standing version - or use the free standing version for the big boy spools. For fun, I made a filament guide too - didn't print this yet cause I'm busy printing the filament holder sides - be aware that this will be "disintegrated" when calibrating Z and printing thing very high. Print Settings Printer: Prusa i3 mk2 Rafts: No Supports: No Resolution: 200 micron Infill: 50% Notes: I printed the bar laying flat so that you don't need support - the part is designed to be printed flat. The filament guide should be able to print without support - the hole for the filament might need some sanding / cleanup after (epoxy coating maybe - for smoother operation)