Ok I left it for last hour and the last 20 layers shifted forward away from the spool? Perfectly in the Y. I aw this before too, could be a misses step, belt tension but off after such a long print. I am thinking heating and voltage problem.

I need to monitor the voltage real time during a print and see if there are problems.

This is awesome stereo project will update you guys later.

So comments. I have 2 sides enclosed and it seems you can tell sides and back have no lift or delamination, the front near both clips and nop cover have lift at bottom and some delamination. I added cover near end of print.

Otherwise I think banding is minimal? there is a slight hysterisis walk to be expected but not major shifting and for this size print I was able to design with no support or bridging. Next run I think I can get it down to 4 hours and less material.