Started testing the other nozzle so loaded E3D ABS this time and set it for 240c and bed at 120c. printing cube this time. Extruder is grinding the filament after a few seconds of printing. Print quality guide says either too aggressive retraction, printing too fast, or temperature too low. I thought I'd try printing slower - is there a setting for this on the front panel? There is an FR icon that is always set to 100% and Octoprint has a flow and feed rate setting. Also, I'm getting over temp shutdowns now and temp jumps from 240c to 300c. After cooldown for many minutes the nozzle would not cool below 103c but power cycle of the printer and then the temp immediately read 26c which is about room temp here.