Re: M2 Extruder Motor Jumping
Posted: Mon Mar 09, 2015 11:56 pm
Forgive my nitpicking, but I think you have two problems that don't interact, even though they have similar symptoms.katmeg wrote:The temperature setting on the prints that failed were set to 240°C as I intended and the nozzle was at the same temperature when I was manually extruding/retracting in the video.
There's a difference between the setting and the actual temperature during extrusion. If the cable to the hot end has broken, for whatever reason, the extruder will cool during prints as the connection makes-and-breaks while the extruder moves along the X axis.
Worse, the fault will be intermittent and, of course, won't happen with the extruder parked over on the side during manual extrusion.
Does the actual hot end temperature remain constant at 240 °C during the failing prints?
That's an inch of filament moving into the extruder and two feet of thread squirting out of the nozzle every second, which qualifies as crazy fast in my book. Back that down to 4 mm/s and the skipping during manual extrusion will definitely Go Away.25mm/s indicated by the parameter 'Vmax e' on the screen
In round numbers, the hot end consumes 3 mm of filament per second during normal printing, so 25 mm/s is way out of line.
FWIW, I tried manual extrusion at 25 mm/s = 1500 mm/min and promptly stripped the filament, although that's with PETG in a V4 hot end.