XY calibration sheet
thingiverse
My precision calibration solution for print bed & XY axis. 20 mm cubes weren't precise enough for large dimensions like accurately spaced holes, so I designed a thin "sheet" to measure my printer's steps/mm precisely. This sheet is only 4 layers thick at 0.4 mm. The exterior dimension is exactly 180 mm. The features and holes have dimensions of 20, 40 and 5 mm - it's easy to tell which is which when measuring with precision calipers in X, Y, and XY (diagonal) directions. I placed the features along the sheet to check for any unevenness on each side.
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