self tightening filament spool bracket and axel set. includes spacers to fit center hole size 50mm-60mm

designed to center mount filament spools. The axel ends fit into 8mm center hole on 608 bearings. 

works great for center mount dryboxes like this: https://www.printables.com/model/1102515-filament-drybox-reremix-designed-for-plastic-house but should work for other center mounted rigs as well. 

Brackets and axel are reverse threaded. pay attention to the +/- label on parts so they go on correct sides. don't cross threads when screwing on the first time. if printed correctly those threads should be fidget spinner loose, no need to force it. 

with the reversed threads when the spool is mounted in the right direction it will always self-tighten and self-center while dispensing filaments. that also means if the spool is mounted wrong or turns in reverse direction it will work the bracket looser. so please pay attention when mounting.