I had a project that didn't work out. I wanted to extrude 100mm of filament to start a re-calibration of the printer. Using pronterface I brought the hot end up to temperature and when I selected extrude it made a grinding/skipping sound and then a bunch of filament came out and then it just dribbled out of the nozzle. OK, I had PET-G loaded and if the filament sensor doesn't like PET-G lets load up some ABS. Same behavior.
I'm running the July firmware, I believe 3.3.1.
Did the same procedure on my other two Monoprice printers (well, calibrate one might as well calibrate them all) and it extruded nicely. And after updating their EPROMs and restarting they were spot on. I even used G code and put the Mk3 in relative mode and told it to extrude 100mm and the behavior was the same as with the Pronterface extrude command.
I've done the extruder calibration on the Mk3 before and it was a success. I was under extruding by 2%. However I recently had a PSU failure. Has anyone else seen the same behavior when running the extrusion calibration, or is this a possible issue with the RAMBo as a result of the PSU failure. Subsequent to the PSU failure I was able to flash the newest firmware. So I'm kind of stumped.
Ideas, thoughts, similar experiences?
I tried your workaround and it worked. Appreciate you sharing your workaround.
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