As long as its normal that's fine with me. Thanks!
IMHO it is not necessary that the unused feeder motor is active. I developed a switch-off-unused-feeder-motor-option for Marlin which works absolutely fine on my dual extruder Ultimaker Original. I'll see it finds its way into standard Marlin.
@Dim3nsioneer: Have you already opened a pull request for this?
@Dim3nsioneer: Have you already opened a pull request for this?
Nope, not yet. Maybe I'll do this tomorrow. I first have to get the most present Marlin version and incorporate my changes...
Ok, it's merged to ErikZalm/Marlin...
:-) great news!!
Just a question: it disables the stepper if not used - more detailed, not heated at the beginning. So no disabling when switching nozzles - correct?
It's not just that simple...
Every time the extruder is changed, it enables the motor of the new extruder and disables the motor of the old extruder. You never have the inactive stepper motor enabled again.
But it's only the stepper! There is no change for the heating of the hotend.
Ok - so worst case (if you dont know what you do) it is possible to move the filament by hand as there is no counter-force from the stepper.
Ok, nevertheless very sensefull feature - thank you for implementation!!
B.t.w. Do you have news about the "pause" discussion we had a while ago?
B.t.w. Do you have news about the "pause" discussion we had a while ago?
not yet...
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anon4321 16
Unlike other motors, steppers use current for holding torque when not moving so will also generate heat when not moving. You should be able to test this. Without filament in the second extruder, try turning the gear during a print then with the power off. During the print, you will probably feel a lot resistance because even though it isn't in use, the driver is enabled and the stepper is powered.
Steppers can take a lot of heat so you might want to just leave it alone.
If it really bothers you, you can dial back the current.
NOTE: Others including myself have damaged drivers while adjusting them !!!!!!!!!!
DO THIS AT YOUR OWN RISK.
See http://wiki.ultimaker.com/Electronics_build_guide
You don't need to use a multimeter, Just use the information above to determine how to reduce the current and then
just reduce in small increments WHEN THE POWER IS OFF.
Be careful and note that the drivers get HOT. Make sure you replace the fan/electronics cover after adjusting.
I would unload all filament and try to match the force required to get the second motor to skip against the first and then adjust a little HIGHER so you don't skip steps on the second extruder causing bad prints.
GOOD LUCK! HEED THE WARNINGS!
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