Spool Holder Bushing

thingiverse

I got tired of constantly adjusting my spool holder on my Formbot Raptor 2 when switching between different sized spools of filament, so I designed these bushings to replace the 8 bearings used by Formbot. This design still utilizes six of the original bearings but eliminates frequent adjustments. Two capacities are accommodated by the bushings - one size for 1Kg spools and another for 5 Kg spools. Although I wouldn't recommend placing a 5 Kg spool on top of a printer, someone requested this feature. You will need additional hardware to install the spool holder bushings. For 1 Kg spools, you'll require: 2 x M8 x 100 mm threaded rods 4 x M8 nuts 4 x M8 washers For 5 Kg spools, you'll need: 2 x M8 x 200 mm threaded rods 4 x M8 nuts 4 x M8 washers As an experiment, I'm using rods, nuts, and washers generated from http://www.thingiverse.com/thing:193647. When generating the washer, I changed its outer diameter to 11 mm to minimize the chance of bearings rubbing against the frame.