Calibration test shape V2

This shape is intended to be a small print that can be used to validate a printer's ability to print some of the more challenging aspects of e-NABLE Prosthetics.
This is a work in progress, shared for the purposes of discussion.
Specific elements tested:
- Overhangs at 30/45/60 degree angles.
- 2mm tunnels, vertical, horizontal (verify 1.75mm filament can feed through it)
- 5mm wide bridge across nearly-level ramp (10 degrees slope), (verify interior is clean)
- Circle (verify x/y ca