Duet 3 mini 5+ overheating stepper Klipper

Thunderrocks33

I installed a duet 3 mini 5+ on my ender 5 and set it up with klipper. both my stepper motors and stepper drivers get hot enough to burn me and I think are missing steps because of it. I have the run current on all my steppers set to one in klipper. the duet 3 mini 5+ is capable of over 2A per stepper driver, while I'm running mine on 1A and even with oversized heatsinks on the steppers they get incredibly hot. Aswell my steppers are very loud. Here's me config
[tmc2209 stepper_z]
uart_pin: PA1
tx_pin: PA0
select_pins: PD0
uart_address: 2
run_current: 1
hold_current: 0.2
sense_resistor: 0.056
stealthchop_threshold: 999999

I'm not sure if changing the sense resistor value could help, I tried changing it for one stepper and while changing the sense resistor value to 0.150 or 0.120 did change something, it seemed to run different and stutter on smaller/slower movements.

Phaedrux

Can you please test with RepRapFirmware to see if the drivers are still getting hot? We need to verify if it's a hardware issue or if it's related to klipper.

dc42

@thunderrocks33 the admins here can't help you with Klipper, although some forum users might be able to. However, it sounds to me that Klipper hasn't programmed the TMC2209 drivers correctly so it is setting the current too high. Perhaps it hasn't put them into high sensitivity (low sense voltage) mode but it has programmed the current as if it has.

Thunderrocks33

@dc42 Thanks

Luke'sLaboratory

@thunderrocks33

I'm the origional porter of the D3 mini to klipper

Hi - I run my D3 Mini5+ at 1.6A RMS with extensive heatsinking (on the back of the board, not on the plastic chip casing) with those settings. I have independently verified that the sense resistor (for klipper, since klipper assumes the .02) and that its correctly delivering current.

Klipper will immediately throw an error if your TMC chips are getting to hot. I wouldn't worry about it unless you see error messages.

As for your motors getting hot - do you know what their rated currents are? If they are rated for low-current use (say, rated for 1A) then running 1A RMS would result in ~80C casing temps, which would definitely burn.

Please investigate the motor ratings, I fully expect the mini is doing what's asked of it.