Quote
Dr. Dave
My prints keep moving across the bed because the motors are not moving the print head back towards the zero position.
Are you 100% certain you gear/teeth/belt ratio is right? That's my initial thinking (and I had that sort of issue) If it is it sounds more like the motors are missing steps for some reason (bad wiring, stepper driver etc), but the 2 could be intertwined. Might I ask what stepper motors you are using?
I've personally swapped from DRV8829s to A4988s with no effect, I switched to Repetier for a test, again no help. I can't replace/swap my stepper motors around unfortunately because, while I can likely remove the gear without damaging the motor, I don't believe I can push it back on a new motor without damage as I'm sure it takes some fancy contraption like it does to remove it.
I've added to the strangeness of my issue as well. The curve or dent starts after the slow layers and then curves back out about 5 layers later. After the 10 or 12 "curved" layers, it prints flawlessly and it's baffling as all crap. being micro-stepped 1/16th I would think the stepper would HAVE to be told to do it by the drivers/firmware.