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After months of printing, getting parts, fitting together, starting with small power supply then deciding to upgrade to bigger power supply (START WITH THE BIGGER POWER SUPPLY - Don't even bother with the smaller one. As noted, changing the power supply later in the build is a freaking nightmare). Anyway, the printer is DONE! I have not gotten past Homing and am having trouble with the Z motors.

I've replaced about 3 Z motors on the left side, the one on the right seems to be fine. The motor on the left just stops turning after awhile and the motor on the right goes fine. Increasing the amps on the driver seems to make it worse. It seems the gears inside the motor give out. One complete movement from Z Home to Z Max and Home again will kill the motor.

I added much oil, too much oil and it has made the nuts come free on the Z parts. Gone through about 10 motors in various parts of the build, have more coming in the mail.

Questions if anyone can please help -
1) Why is one side of the Z axis always harder on the motor than the other side? Suggested solution? Moving the carriage up and down by hand seems to have no binding that would cause stress, something when the threaded rod is added in... Latest version of Marlin now supports dual Z motors, would this help?

2) I used super glue and JB Weld to hold the nuts in place on the Z axis, oil has made the glue from free. Is there a better way to secure the nuts to the Z parts?

3) Any chance of a remix on the Z motor parts to use NEMA 17 motors? :)