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This cube contains of 4x5 axes with length 50 mm and a diameter of 3 mm. The radius error is less than 0.02 mm. To fit on the axes there are tubes with a wall thickness of 1 mm. The radius error is less than 0.02 mm. The tubes are printed above the axis to make sure that there is enough space between tubes and axes. The gap between 3 mm axis and the tube is: 0.05, 0.1, 0.15, 0.2, 0.25. 0.3. RULES (PA12 /2200 Laser sintering): Maximal radius error (Designed by Tim C Lueth, 2010-Nov-26)