I’m putting this down as it may help others. I am really loving how PETG prints, and the warp-free large parts are a godsend.
I’m running 240C hot end and 90C bed with gluestick.
At first I was getting a lot of failure with what looked like the filament jamming below the pinch roller. What I found is that unlike ABS, you need minimal force on the pinch roller for the PETG or it can create a problem. I would typically have anything more than an hour print fail, and when I removed the filament, it had bunched up below the pinch roller. What I found was a post on another wade extruder printer’s forum is to only tighten the pinch roller until it extrudes clean. On ABS, I always crank the thing down as I was having problems of slipping. I use the recommendation of how much space between the thumbscrew and pinch roller lever. When I started keeping the pinch roller just tightened enough to extrude, my problems all went away.
As for strings, PETG can be a little extra stringy, but make sure you calibrate your esteps. That helped tremendously. I still get the odd hair now and again, but overextruding PETG is NOT forgiving. I have done 48hr prints in PETG now and get great results. So much so as I may not buy ABS again.