/diy/ - Do It Yourself

I've been fighting layer shifts ever since I built this damned thing last summer, but got an interesting result tonight, an XY shift mid first layer.
>Voron 2.1 (core XY motion)
>Esun ABS+
>tool 248°C, PEI bed 100°C
>120mm/s print speed, happens just as often at 50mm/s too

Any help bros? I tried re-tensioning the belts, turned the A/B stepper driver potentiometers clockwise 1/4 turn. It's definitely the print head that's moving and not the print/bed- that print is stuck solid and going to be a bitch to remove.