Smooth end for Linear Rail to Minimise Belt Wear

If you have a rail configuration for your 2020/2040 frame 3d printer (Tevo Tarrantula in my case) and belt for the x axis runs in contact with with the edge of the rail you may want something like this to reduce wear on the belt.

Update: Added a version that will take a 4mm PTFE tube.

Update: Added a redesigned version to improve print quality.