Took zheng3's bearing, pulled it into Rhino, and changed a few things to better fit my filament spool. -Made the main diameter 30mm to fit my spool -Added a flange to the outside of half so it'd stay put -Made the inner diameter fit an M8 rod perfectly The bearing is still split in half for easy BB insertion.Printed on a Prusa i3 .25 layer height A bit of infill No support 2 perimeters Any of these setting can be changed, this was just my setup Once the pieces are printed, add some BB's, glue the two halves together, and you've got yourself a printed bearing!!!