Square Bore Pulley for M3D / ThreeD Nano v4

This is a  SQUARE-BORE PULLEY  spare part for theEasythreed NANO Mini 3D-Printer (and some versions of the M3D printer except for the Micro+).In case your X or Y axis is not moving, but making a clicking noise,  one or more of theses pulleys may be broken.
You will notice small cracks in the corners,  where a rectangular metal post sits in.
This part can not be ordered by Banggood or even the manufacturer themself, so here is the part.
The structures are so fine that it will not be able to have them printed with an off-the shelf FDM printer. You will need SLS or another equally fine structured 3D printing technology.
Use plastic and not metal as printing material, since this part has to be fitted to the their counterparts.