A printable version of an LM8UU holder used in the Anet A8 and A6 printer ranges as well as others. Each print of this will also require 2 cable ties to hold the bearing in place. Ideally the holes on the back side will also need to be drilled and tapped with an M4 thread.
I plan to design a belt holder to go alongside this part for the A8 x-axis.
If using this design on the y axis you might find that your y endstop will no longer trigger as the bearing will go straight past the endstop that it would normally hit. I plan to revise this design to provide a separate bearing model eventually.
2 cable ties required per printed piece.
Tapping of the four screw holes to M4 thread recommended. May be possible to force a thread directly with the screw but not recommended. I would not recommend threading through the entire length of the hole. The fit shown in the picture was achieved by threading to the point where the bit was about level with the exit hole.