support diameter calibration —

Founded support diameter calibration models & stl files for printing
Calibration squares
ShabbyPenguin
Support Hard disk extern 25
SamSamicoDesigner
Tissue Box Holder Unicorn
Pierrolalune63
Aerosol holder
enricosx
ToothBrush Holder
alex_3dprint
Vulpix Alola
BODY-3D