Presto Pegasus Symmetry R5 part: Improved Battery Mount

This is a improved battery mount for Presto Pegasus's Symmetry R5 frame.

Compared to the previous version of battery mount, this new design is improved by:

- Increasing the overall thickness of the battery mount to improve durability
- Increasing the overall volume/size of the strap holding area to improve durability
- Fully compatible with ABS filament

Normally, Carbon reinforced ABS is used to print this part but TPU is also recommended if you don't want brittle characteristics