Diameter calibration ring
thingiverse
I'm keeping it simple here. I required a model to verify the internal diameter my printer was producing. This design is exported from Autodesk Fusion 360 with a "_High Refinement_" setting so the circle is more precise. 1. One small ring has an outside diameter of 15mm and an inside diameter of 10mm, standing at a height of 3mm. 2. One large ring boasts an outside diameter of 30mm and an inside diameter of 20mm, reaching a height of 5mm.
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