608 Bearing Washer

Squeeze a bearing between two of these and the small inner portion will hold the bearing steady while the recessed outer portion avoids binding with the turning bearing.

Equivalent to using small inner washers and large outer washers, but I didn't want to run to the hardware store.

SCAD file is parametric, can be easily re-sized.

Pictured is this thing being used in my Printrbot extruder. The original wooden spacers were rubbing on the bearing--replacing them with eliminates some frict