Printed and correctly fitting.

Printed and correctly fitting. Now I need to make an Arduino program to control it. Thinking on adding an LCD to set manually some some parameters like speed or distance.

Source: https://github.com/avalero/house_garden/tree/master/slider

Steel reinforced belts with 20tooth pulley, right?

How does it work? Do you think there might be any problems with the belt after prolonged use?

Yes, reinforced belts and GT2 pulley. It works pretty nice (considering that the rods and LM8uu are not of the best quality).

There should be no problem with the belt as it is the same one used for 3D printers and I have not noticed that they have problems after prolonged use.