This a damper for a NEMA 17 or any motor that has the same dimensions, in order for it to work you will have to print 2 and put 1 on each side of the motor support.
It is not as effective as some you could buy but it is a quick and rather cheap alternative.
I cut some holes in the model to reduce material usage but if you want to change that I included the CAD file.
The author marked this model as their own original creation.