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Axis linearity calibration test by ttsalo is licensed under the Public Domain license.
© 2012 by ttsalo
Instructions
In perfect world, all six pieces should be identical, except for the sequence markers. In addition, the diagonal pieces (nr. 5 and 6) should be straight. (All pieces should of course be straight but for the others it's seldom a problem.)
As can be seen, my pieces are pretty far from identical. Looks like in my X axis, the relationship between stepper rotation and print head movement is nowhere near linear... edit: the steel reinforcements in the X belt were completely busted
