I’ve started working on a project to map the motion of the carriage using a mouse attached to the spindle and a RPI. Not very far along. My intention is to use it to “automagically calibrate” the machine for belt stretch in a gross sense the way we typically do it by hand - move along an axis a known amount and compare what the machine thinks it did vs what we measure with the mouse. I think I can also detect out of square x vs y with a little math. One of the things that will come out of that is a map of uneven belt stretch, which could potentially be used to adjust a project in X and Y like you would for an uneven bed in Z (not so common in CNC circles, but pretty common for 3d print and circuit board work). Not sure it’s worth it to do that, just saying you potentially could. @Julien did something very similar: DRO-based X/Y calibration jig (wannabee)
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