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So, after 10 hours of print (still ongoing) my stepper is definitely hotter than previously. It is 5C-7C hotter than my z stepper, which has plastic shim installed and also separated from the frame (and runs hotter than previously). However, Y motor is by touch about 5C cooler than my 60C bed. The spacer is intact and pretty cool by touch. The temperature of the motor stabilises after few hours, so I doubt it will change much even after few days of consecutive printing. The problem can occur during a hot summer day though, it is around 23 degrees now and things will change when it will be 33C...