Pulley Thread Fix

For whatever reason the pulleys that come with Velleman VERTEX K8400 printer have very short thread that is easy to damage. Instead of replacing entire pulley and facing the same problem again, I came up with this simple solution. 3d printed ring with much longer thread is placed over the pulley. Mounting screw holds on the thread in the ring and passes through the original hole in the pulley, which has to be slightly widened.

This ring was designed for K8400 printer's pulleys, which are moun