Zero force filament holder / roller for Ender 3 - needle bearing
Description
the best spool holder and roller. I designed this as my extruder had problems to pull filament form heavy spools on the stock spool holder. That lead to uneven extrusion results. The outer diameter of the roller is about 51 mm at the widest point (a 1mm ring at the front to avoid that the filament roll can come off. this should fit for most standard filaments according to my research. After assembly, I bent the holder that is mounted to the printer about 3 degrees by brute force to the back. that gives the roller a slight slope, to make sure the roll stays on the roller. It requires 2 bearings like these: https://www.amazon.com/gp/product/B07GC8KKR7/ref=ppx_yo_dt_b_asin_title_o02_s01?ie=UTF8&psc=1 uxcell NA4906 Machined Ring Needle Roller Bearing with Inner Ring, 30mm Bore Dia, 47mm OD, 17mm Width The bearing outside is press fit to the printed roller. the bearing inner part is press fit on the stock roller after cutting off the ring of plastic on it's front. Have fun.
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