how to configure TMC2209 (1 reply)

Hi there,

I recently upgraded my Kossel Mini (Delta) from an Mega2560 to a BTT SKR3 board, with (MKS TMC2209 V2.0) drivers in UART mode, running Marlin 2.1.2.2 - so far with very good results.

But I'm having issues with the Extruder stepper motor, in particular when the motor is becoming warm, after approx 1 hour. When retracting, it starts making funny noises and its losing steps - active cooling the motor really helps ... - and I never had these issues when running the motors with the previous A4988 drivers

- the 4 drivers are configured to run in UART mode, M122 works fine, the RMS current is 800mA
- my 3 XYZ-stepper motors are Wantai "42BYGHW811" rated for 2.5A
- the extruder motor is a Wantai "42BYGH4413A G5.18.X" rated for 1.3A

The TMC2209 drivers, although set to run in UART mode, have this potentiometer to set the current - is this completely useless ?

I'm pretty sure its not ok to run my different motors all with the same 800mA - what would you guys suggest to use ?

thanks for your help