I saw that too, the screws were too long.
I already got the motor with the 3d printed holder so I didn’t expect that to be the problem 
Unlucky, hopefully with the new motor it should work straight out the box
Yes it was bad luck, but I also think the new motor will fix most of the problem, I am already looking forward to it!
There are good news!
I got a new motor and used shorter screws to mount the motor.
Now the motor spins very smooth and perfect! Initialization also works very good and the shaft is now actually rotating forth and back.
So again thank you to all the tips and help.
And thanks @Juan-Antonio_Soren_E for the tip to open the motor, which finally showed the actual problem.
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