Improvements of the original design
This bushing increases the distance by 2.5 mm (13.5 mm instead standard 11 mm) between the Y-rod axis and the ground plate of the hot bed. It is necessary to use the reinforced hot bed plate
Also the bushing has the grease holes for liquid lubricant.
Material: Nylon or PLA, not ABS
The hole axis must be Z-oriented for printing.
The rod hole must be slightly processed after printing. The bushing should easily slide along the rod and should not have a backlash.
To handle the hole, do not use a drill bit, this may damage the part. Use a reamer or a semicircular needle file.
It is recommended to lubricate the rod with a liquid lubricant.
You will need four M4 nuts per each bushing, 16 total. Also you can use the self-locking nuts.