This is a gadget I built to check if both sides of Z are at the same height. You just slide it under one side, with the base on a level surface that the printer is on. slide the Feeler up the shaft until it touches the base of Z near the screws. You might want to press down on the end to make sure it is not going to move it might be slanted down a little. tighten the screw and move it to the other side and see if it is at the same height. with the motors powered down you can adjust this by turning the right side screw with your fingers. After doing all the work I decided a ruler is easier but you are welcome to try it.
Don't use any supports or it will mess up the screw threads it should be able to print without them. Does not need a raft or and special fill. This should work on any printer that it fits.
Using supports will likely mess up the screw threads
a small file may be needed to clean up the screw threads on the bolt part.