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they get misaligned when tightening the blocks willy nilly. aluminum is soft, and will deform when the screws get gighhtened. leaving the screws loose causes other issues, like printign artifacts, screws that unscrew themselves and other things.

i had had my printer for 2 months and getting these just right is what took me the longest. i even printed a belt clamp but i don't want to attach it and risk misaligning the bearings.

i align the bearings i did the following.
1) attach all screws loosely
2) start by tightening 1 screw
3) on another bearing block tighten another screw,
4) now i move the plate, checking if it feels too tight. if it is i loosen the screw and tighten a different one, and check again
5) now i move on to a third bearing repeating steps 3 and 4 then i move on to the 4th bearing and repeat again.
6) now i go and tighten the second screw on each bearing testing between each tightening. if its too tight... i try a different screw on the same bearing.
7) i repeat this process for all 4 screws on all 4 bearings, (including the 3 on the carriage)