Extruder Motors will not move

I am building a Dual Extruder printer using the BigTreeTeck SKR 1.4 Turbo board with TMC2209 drivers and running Marlin 2.0. I have configured the Extruders count to 2 and set the thermistor value for the second extruder. I have all other functionality working (X,Y,Z axis are moving as expected, hotends heat up and are under PID control, etc.). However, when I try to extrude filament the Extruder motors will not move.

I have confirmed the motors are fine and in working order, and also check the cables running from the Board to the motors and they all check out. Is there a configuration Item I am missing or something that is preventing the firmware from actually enabling the extruders and sending data to them?

- Dave

You say "hotends heat up and are under PID control" but are the hotends hot when you attempt to move the extruders? By default Marlin will not move the extruder motor (PREVENT_COLD_EXTRUSION) unless the extruder temperature is above a certain threshold (EXTRUDE_MINTEMP, 170C by default).

Yes. I understand that Marlin has safety settings in place, but even when at temperature, the extruders will not turn.

- Dave

OK - the most probable issue is a problem with the driver enable signal. You don't happen to have SOFTWARE_DRIVER_ENABLE turned on? That is known to cause problems and should only be turned on if the hardware does not have a physical enable pin for the drivers, which is definitely not the case for an SKR 1.4.

That was it! I know better that to use that, and I swear I did not turn it on, but when I checked it, it was turn on! Thanks for your help!

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MMcLure
OK - the most probable issue is a problem with the driver enable signal. You don't happen to have SOFTWARE_DRIVER_ENABLE turned on? That is known to cause problems and should only be turned on if the hardware does not have a physical enable pin for the drivers, which is definitely not the case for an SKR 1.4.

What would be the next thing to look for? SOFTWARE_DRIVER_ENABLE is already disabled.
I'm having the same problem but its only happening on the extruder motor. The motor won't turn - doesn't extrude nor retract.

Also using SKR 1.4 Turbo and TMC2209, and latest Marlin 2.0 bugfix firmware on Ender 5 plus.

X, Y and Z axis are working fine. I have 2 endstop switches on X and Y axis and both are working normally.

My tmc motor currents are all in default at 800mA and all motors are in stealthchop mode. I already tried to use spreadcycle for the extruder motor driver but the problem still exists. The filament is not being extruded.

Also tried the other suggestions of enablling/disabling the SQUARE_WAVE_STEPPING and set the MINIMUM_STEPPER_PULSE to 1 or more, but still don't work.

TMC2209 driver's busted.

I swap the driver from the different axis and the extruder starts working. Good thing I ordered the 6 TMC2009s bundle in Aliexpress.

Its weird because the M122 status says the driver is OK and connection is established. The debug logging looks normal too.