Hello all,
During printing and after 10 or 15 minutes, the head shift (y axes) and the motor is very hot.
I’ve verified Belt --> seems OK
Pulley --> seems OK
Axes lubrification --> done with PTFE
Hot head and cable do not interfere with the frame.
I’m a little bit lost, the shift appear after 10 layers!
At the beginning (just after assembly) it was OK. Now, 1 month later, it fails.
Do you have ideas?
Thx
Hi!
Yes I have an idea… 
First switch off the printer.
Then check if you can easily make the Y-movement by hand from one end point to the other end point. If you need some more force, then you have a problem in the area of the axle bearings. If you need power, then the motor also needs power and this will make it even warmer than usual.
-> Check that the axis are exactly parallel.
Layer shift: Check whether the pulley is really tight on the stepper motor axis. If the motor has to transmit more force to move the axis, the pulley loosen over time. Tip: Before tightening the pulley screws, flatten the stepper motor axis slightly with a file on the side where the fastening screw is located.
Try this at first. 
Greetings from Berlin
I have the same problem with shifts along the Y-axis.
I marked the top of the motor axis and the pulley in oreder to check if there is any shift in relative position. So far not but the nozzle bumps into thick plastic bubbles after about 3 layers. My temperature is at 190 should that be higher?