The problem was one of wires broke where it was soldered under the heat-shrink, it was okay until the chain would loop uphill when the broken section was in the loop the tension on the wire would pull the connection apart and the X stepper would go bonkers, until the chain flattened out again. The Triumph started doing nutty stuff at about 2 years old, and only in certain spots. Two of my lasers- my 'good' Gravograph LS900, and my Chinese Triumph 1390- have both had wire issues within the Y-axis drag-chain.
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