Supports calibration test

small (20mm x 20mm x 10mm) supports test

features:

1. short print time (20 minutes on 0.2 quality mk3s+ profile)
2. horizontal and vertical m3 hole
3. convex and concave vertical fillets
4. convex and concave horizontal fillets
5. large overhang close to the build plate
6. bottom of a sphere printed on top of supports
7. supports beginning on the print itself (on both flat and round surfaces)
8. thin, rounded overhang

files are already in the correct orientation
print using supports: everywhere