Thank you. I can't find their instructions on their website. I have opened pronterface though and can change the esteps but I can't seem to change the speed without going into the firmware itself.
pronterface won't control the UM3. It has 2 computers. the one that stores the steps/mm isn't connected to the external USB connector.
The second computer in the UM3 is a linux computer and that computer decides the steps/mm and then sends the correct gcode on to the Marlin/arduino based computer.
Anyway here is the instructions to change steps/mm:
https://support.bondtech.se/Guide/21. QR Software Configuration/36.html
Yes you have to adjust the steps/mm - there are instructions at the bondtech website. There is a tool that does it for you or you can ssh into the printer and do it manually. Both methods are explained by bondtech. If you upgrade the firmware on the UM3 you will have to redo the steps/mm adjustment.
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