Don’t get me wrong, I agree it shouldn’t. That is why I asked about your slicer. All other dimensions are just as accurate as a .4mm nozzle print from the exact same printer, except vertical hole ID. This leads me to believe some weird slicer glitch is going on. I will design a test piece and test it when I catch back up on printed parts orders….
The part I have been testing with is the Large XY piece. Everything is perfect, prints way faster, the two hole that connect with the XYZ part undersized and need to get drilled out, the rest of the dimensions are great. Tried all three part versions, same hole is tight. I will try another slicer but that means a .4mm print then a .5mm print, both at 75% layer height ratio/nozzle diameter.