608 Bearing Airsoft 6mm

thingiverse

Yet another 608 bearing to be used with 6 mm Airsoft BBs. I wanted a round model to print instead of the blockier 608 airsoft bearings around. Made in 5 minutes with Fusion 360. 4 mm center shaft, 6mm vertical bearing bore diameter (which have mostly been cut out), 6.1 mm horizontal bearing bore diameter. .05 mm extra width for each inner and outer bearing bore horizontal diameter. I pre-selected 7 Airsoft BB's around 5.842 mm diameter for easier spinning. If you want tighter tolerances, choose slightly larger BB's I tested various sizes and ratios and decided on this tolerance level for low rotation resistance and fairly little freedom of movement. I got the best outer bearing spin times with 6.2mm horizontal bearing diameter (.1 on each bearing for very wide bearing channel) but it was very loose and not needed for my use (filament axle spindles). https://www.thingiverse.com/thing:2229433 is a good option for slightly looser tolerances but better pre-breakin spin time than mine.