The most common 3D printer part failures include clogged nozzles, worn-out extruder motors or gears, and wear and tear on your build or print surface. This can apply to both PEI sheets, glass, buildtak and others.
Improper belt / pulley / idler alignment related issues are also seen frequently. This can result in uneven wear and even damage to your belts if the misalignment is severe enough.
These issues can all be caused by improper setup and configuration of the machine in several areas.
Taking care during assembly or maintenance will largely eliminate these problems.