Wall calibration
thingiverse
Calibration printing starts with calibration of wall thickness, height and distance. Walls are calibrated at 1, 2, and 3 millimeters thick, and 10 and 20 millimeters high. The minimum inner spacing is 30 millimeters, and the outer print size is 36 millimeters. Repository for FreeCAD design file: https://github.com/hsolg/3d-printer-calibration
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