EDIT 12/05/2015:Added a new file with exact 45 mm length and 15 mm diameter for the bearing. On printer's I've owned, holes of exact dimensions always turn out too tight, so I typically design parts with ~0.2 to 0.3 mm extra clearance. This file may work better for you.

I wanted some simple LM8LUU bearing blocks to use on the y-axis of my Wanhao Di3. Bearings should just press into them. I'm not certain they are sized to work exactly with standard aluminum bearing blocks, but they work great if they're used to replace all three bearings.

M4 nuts should press fit into the top recesses. You will need longer M4 screws than those found on the Di3.

The "offset" file is to use for the bearing that engages the y-axis endstop.

Please let me know of any adjustments I should make. These were designed quickly for parts I have on hand.