So my original MPCNC was esun PLA+ and then my burly and now the new Primo will be also. I have done every calibration that I can think of and just about exclusively print with the esun PLA+. The only issue I ran into was the dimensional accuracy but that seems to have been taken care of by calibration. After all I am using a heavily modified Anet A8 so I can only expect so much. I also had some pieces break from over tightening some bolts/screws. I will post some pictures in my build thread in awhile if anyone is interested. https://forum.v1e.com/t/slow-upgrade-525-to-primo/21719?u=h0m3r2000