Ultimate Calibration Cube

prusaprinters

<h3>10 in ONE</h3><ul><li>Dimension of planar sides = 20mm</li><li>Dimension diagonally = 25mm over chamfer (also over round edges) - parallelism &amp; orthogonality (skew)</li><li>Inner Dimension, window is 10mm and 12mm diagonally (4mm walls)</li><li>Bottom has Two rings .2 and .35 mm wide for several layer heights (1st layer squish)</li><li>Bridge 2×10×2mm&nbsp;</li><li>Overhangs 45° and ~35° edge (~55° overhang) on the inside - up to 90° in the windows</li><li>90° corner for alignment of sides with bottom and top skin and extrusion / acceleration&nbsp;</li><li>Ringing and detail check on the letters</li><li>Stringing check when printing the corner column (travel through windows)</li><li>Bottom check via unsupported roof in &nbsp;the center and Top/Ironing</li></ul><h3>Orthogonal?</h3><p>Why is it so hard to detect a skewed gantry with a normal calibration cube?</p><p>A ruler will only see the 20mm, and the caliper will measure the parallel sides and only notice .05 less which is within printing tolerances. But when measure diagonal you notice a much bigger difference of 2mm (± 1mm) &nbsp;in this exaggerated example with 4° deviation.&nbsp;</p><p><strong>This is why the Ultimate Cube uses chamfers on the Z corners (can't print clean round in that direction) and round on the XY plane. A perfect Ultimate cube will measure 25mm diagonally.</strong></p><p>a normal cube can be measured diagonal ↦ 28,2842712… mm &nbsp;but it depends on the 90° edge condition and printing as there is no flat/round surface.</p><figure class="image"><img src="https://media.printables.com/media/prints/315981/rich_content/6d4e00dd-9a7d-47d1-bf06-15f56c6323b1/22-326orthogonalsquare.png#%7B%22uuid%22%3A%22a05e67a6-8242-49f6-838d-d8bc36b7af0c%22%2C%22w%22%3A900%2C%22h%22%3A675%7D"></figure><h4>SpeedCube</h4><p>Also a speed test with walls, retractions, travel, infill, bridging, details&nbsp;</p><h5>better measurement</h5><p>Measure XY, XZ and YZ diagonally and all are correct (25mm) - all 3 axis are dimensionally correct and parallel and orthogonal.</p><p>&nbsp;</p>