square with circle, redux (2 parts)
thingiverse
I LOVE the idea of a "square with circle". This 10-second model is a perfect circle of 150mm outer diameter, 10mm width (so 130mm inner diam). It is inlaid in a square with 150mm inside dimensions, 10mm width (170mm outer diam). Both are extruded upward 10mm. The two parts do not actually touch. If your printer/slicer is perfect they would not be connected when you finish. I personally will use this to dial in layer height at the corners of my bed. Feel free to stretch in x, y, and/or z to fit your own bed :) I uploaded as either one STL with two parts, or two separate parts. Use whatever works better for your / your slicer.
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