Finally some good news: the first 20mm calibration cube sliced with Simplify3D measured in around 20.05-20.08.
I’m going to just go ahead and re-print all the middle parts of the legacy design before I futz with it any more. It’s tried and true, and I just want to get it working reasonably without introducing any possible issues from the new center design. Fingers crossed this will resolve all my issues…
I’ll keep you updated. Thanks again for all the help. What amazing support for what’s basically a free product!