Why does everything have to be so hard . . .
In the pic you see a recently failed print. The lower levels were nearly perfect. There is a section with a skip below the t on the build plate. When the print got to the upper layers, the ones with more retractions for nozzle jumps, there are way, way more extruder skips to the point where I terminated the print. When I discovered the skips I slowed the speed to 50%, so it was at 1.6 mm3/sec. I did have the "retraction prime extra amount" set at 3mm3 to compensate for the blob that oozes from the nozzle during a retraction move. If I can make the temp about 220C, that blob more or less goes away. I will retry with the value set to 0.
I have not replaced the teflon part in a long time and have used a 1/8" dia drill bit to reshape the hole.
I've been printing for 6 years now, m/l. At this point, it still feels like every print is an experiment.
Here's hoping you have plenty of TP. If not, I can box up some corn cobs from Iowa to send your way.
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gr5 2,224
I don't recommend it but you can mess with the current. Generally higher current means higher torque but not if the stepper driver gets too hot in which case higher current then means lower torque.
So M907 sets the current for all the axes. This is the default, sets E axis (extruder) to 1250ma.
M907 E1250
So you can (for example) up it to 1300 ma with M907 E1300. Or lower it to 900ma with M907 E900. You can insert this in the gcode wherever you want the current to change. The current will be remembered at the new level until you power off the machine. If you want to save it more permanently add M500 which saves this setting to longer term memory on your printer.
But why do you want to up the torque? It's skipping a lot - well have you changed the teflon part in the last few years? You should be changing the teflon part every 500 hours or so - check your printing hours in the menu system on the printer. As that teflon gets old the extruder has to work harder and harder until it starts skipping.
Or maybe you are just printing too fast for your extruder.
Or you could upgrade to the "plus" to make yours a UM2+ printer.
Or you could do the meduza upgrade (I sell a $19 kit but only if you are in USA). The meduza upgrade and also the "plus" upgrade increase the feeder torque by 2X and it's a great upgrade. The "plus" upgrade costs around $400 USD but you get some other nice bonuses.
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