I had some issues when i first built my mpcnc printer. First was the extruder i bought from ebay. part for part identical to the ones ryan sells. but mine came down to having a bad nozzle. I got that sorted and it started to print a lot better, but not anywhere near usable yet. layers werent fusing right, infill was pushing through the perimeters… I moved away from cura. found mattercontrol from matter hackers and i haven’t looked back. best prints so far. Cura is great for some of the name brand printers out there, but matter control produces a much better part, even if i use the cura engine in matter control i still have better results. im going to try out simplify 3d in the next week or so, once im done printing another mpcnc, and ill let you know how it turns out.