Supports calibration test

small (20mm x 20mm x 10mm) supports testfeatures:short print time (20 minutes on 0.2 quality mk3s+ profile)horizontal and vertical m3 holeconvex and concave vertical filletsconvex and concave horizontal filletslarge overhang close to the build platebottom of a sphere printed on top of supportssupports beginning on the print itself (on both flat and round surfaces)thin, rounded overhangfiles are already in the correct orientationprint using supports: everywhere