I’ve noticed that printing of horizontal cylinders results in the cylinders flattening out to an oval, even with supports. It’s not by much, but noticeable. I’ve tried with both Snapmaker3D and Simplify3D and both give similar results in that regard. Anybody else notice this? Is there a fix in the printer’s internal settings?
Sometimes this is an optical effect caused by distortions around the 45 degree overhang marks.
I recommend measuring and adjusting the 3D model if all else fails.
You can also try printing with a lower flow rate, just 97 instead of 100 often works to relieve pressure from the nozzle onto the part.