I couldn't find any settings for extruder direction in the code either (I was thinking of reversing the axis, which is in there), but I haven't looked at the latest 5d code for a while. I found some 5 kg steppers from Kysan hopefully they'll be in soon. Just for reference, Adrian's fast Mendel extruder uses a 4 kg*cm Nema 17 stepper, which is pretty torquey. If you're using a stepper driver for the extruder motor, you can of course just increase the drive current using the potentiometer. I've got some stronger steppers on order you can also change the current setting on the extruder controller board, details in this thread:
My stepper is quite weak, and if there's too much friction and back pressure from the extruder, it behaves just like that - it goes forward 3 steps, then jumps back one step (full stepping) - it doesn't have enough torque to complete the revolution. Jeff B I think you're using the extruder controller board, right? My stepper driven extruder is on the back burner, because I had a similar problem.
Good to know, and a good reminder that one should actually test things occasionally.
Heh, apologies GeertB and thank you Nophead! I did the experiment, and yes, reversing the stepper motor plug does reverse the stepper direction.
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