Cap openener GT2

SheepsFeaTheR made a fully 3D printed cap opener and when looking at the design the use of a 6mm GT2 belt came to mind. I guess that most 3D printer owners will have some GT2 belt lying around while maybe not everybody has TPU or TPE filament for printing the belt.

Hence I remixed his design to make it work with a standard GT2 belt. There are two versions - you can use what is best for your application:

- Cap Opener GT2_OUT with the profile on the outside and,
- Cap Opener GT2_IN with t