How does loose belts (backlash) cause gaps in diagonal lines you might ask? Here are some diagrams to help explain. Please don't tell me the diagrams are wrong without spending at least 30 minutes drawing it out very slowly and carefully like I did. Start with the Y axis backlash only diagram as that is the simplest one, the move onto X and then XY. In parts of these, the head isn't moving at all, or retraces it's path so the picture doesn't tell you everything that is going on but it does s
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