I have a habit of finding weird ways to break things in cars; it's apparently carried over! :cool:
When the extruder stepper is at full speed with 1625mA during the few millimeters of priming, the motor doesn't skip and lightly chews the filament. When the extruder stepper slows down and is printing the cylinder, it's definitely skipping backwards just as it does in the higher volumetric speeds with lower currents. I have a small red mark on the end of the extruder stepper shaft so I can watch this instead of guessing (it should be almost visible in the video).
The extruder motor is the same size as the others, around 42mm a side.
I've also uploaded the test files I used here (https://dl.dropboxusercontent.com/u/10655012/Test%20Files.zip) just in case I mucked them up again.
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Ok, Das... you're not allowed to play any more. You're just confusing everything.... if you can't break things the right way, then.... ;-)
No, really, that's weird. I would have expected that at the highest current it would still extrude and eventually just tear up the filament, rather than totally failing even at low speed - and STILL skipping.
With your 'quiet' underextrusion at 1625 - is that still skipping back, or is it just slipping past the filament and tearing it up, leading to underextrusion?
At higher settings I'd have expected it to still extrude some, and certainly not to click backwards. Maybe it's just exceeding some absolute limit on the motor... not sure. I'll ping the UM R&D folks, and see if they can comment.
BTW, is your extruder motor a different size from the x & y motors?
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