Improved beltclamp for Geeetech G2S

The original design of the Geeetech G2S uses an aluminium block with two holes. The toothed belt is fixed to that by punching holes trough the belt.

This design leaves the belt untouched, enabling the possibility to retighten it when it becomes too loose and giving it a longer life.
The block mounts with the same screws as the original design.

To upgrade your printer the following parts are needed:
- 3x 3D printed block
- 6x M3 nut

I left the toothed belt uncut and fixed the extra