I'm trying to torubleshoot an issue with my 3D printer (Robo 3D R1+). It cannot print vertical walls well any more. Here is a picture of what it looks like: The walls are very inconsistent. To correct this issue, I've tried: Changing the nozzle Tightening the hotend (to remove wobble) Dehydrating the filament Using brand new (good quality) filament Printing faster & slower Printing hotter & cooler Trying different slicers (cura & simplify 3d) Putting on a belt tightener The 5 motor drivers are all new as well, but this was happening before I changed them. Any help is appreciated!