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di gNat66
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Designed these to check steps per mm, and, also squareness of printer. The short side should print at 30mm, medium at 40mm, and long at 50mm. They are 20mm thick so you can check all axis steps per mm at a time. These are based on the Pythagorean theorem (A^2+b^2=C^2) if 30mm and 40mm sides are correct and the long side (hypotenuse) is not 50mm you printer is not square.
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