conlank
commented
2 years ago Rotation distance is based on the physical printer. Running the TMC2209 in Standalone mode will cause them to set their micro-steps using the jumpers on the board, the fact that this is corrected by changing rotation_distance, which should be calculated with this formula rotation_distance = <belt_pitch> * <number_of_teeth_on_pulley> suggests this is the case. You could change the microsteps: 16 in the config to microsteps: 32 and keep the rotation distance set to 32, as if your rotation distance is doubled and you enable UART, you will run into this problem again.
Mousedroid98
Hi! I'm having issues with my QQ-S Pro install of Klipper. I had this install working just fine last week, but an unfortunate micro-sd corruption incident required me to fresh install it again. However, this new time around, I'm finding that the printer seems to think it's moving far less than it is (e.g. the bed is registered as 190-ish mm). A cursory measurement seems to suggest the printer is moving roughly double what it thinks it's moving. This is wreaking havoc with the printer as I can't properly calibrate or level the printer.
I'm running the TMC2209 config with standalone (turned off the UART sections, which worked for me last time), and I've checked VRefs and such. Not sure what's causing this issue or how to fix it, but I'd like to keep using this excellent Klipper config. Thanks for the help!
Edit: Setting the rotation_distance parameter in the config file to 64 (double of the previous value) seems to have corrected the printer's overshoot, but I don't remember this being an issue with my previous install. If this is an expected change/something that makes sense, please close the issue.