when I installed a Z-height adjuster on my first Prusa i3, I inadvertently repositioned the endstop holder for the Z axis. The first time I homed the printer, the Z axis didn’t stop because the plunger I used for the endstop missed the endstop arm by less than a millimeter—but enough to cause the print head to run into the print bed.
When I installed a heated print bed and Y-axis upgrade to a Printrbot Play I did not pay enough attention to how the wires were routed. It took a lot of noise from the belts slipping for me to realize the cables were keeping the Y-axis from moving its full range of motion.
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