Anders Olsson 136
telophar
My UM2 came with a plastic knob which there was no information about in the manual, but I just assumed it was to be used as a guide for the filament.
The feeding, at least for ABS, appears to work much better for me when the filament runs around this knob.
I have also noticed a few things regarding the feeding mechanism.
- When changing material, the stepper motor apparently is running at reduced current, since it skips steps when the filament hits the nozzle.
- On my printer there appears to be a firmware bug, because I have to power cycle it after changing material for the "move material" option to work.
- Using the move material option, the stepper motor is much more powerful than when changing material, which means it easily grinds down the filament if one is trying to feed to fast.
I am curious to why the stepper motor apparently has much less torque when changing material (at the low speed in the change material cycle).
When the filament hits the nozzle, it still extrudes with a much higher speed than for normal printing.
Is there a setting somewhere in the firmware where the torque of the stepper motor could be reduced?
I mean, when the stepper starts grinding the filament down, it is not feeding anyway, so limiting the torque a bit should not have a negative impact on the feeding i think?
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gr5 2,225
Yes. There's a ton of ways to do this - maybe the easiest is you can just add a gcode to do this.
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