I am doing development work on a Teensy, and the Cura software is sending G-code commands to my device. I'm pretty sure it's an automatic probing feature, but it's driving me crazy trying to debug some serial IO. How can I disable this feature?
You can prevent this behavior by disabling the USB printing support in Cura. Open the "Marketplace" and go to the "Installed" tab on the right. Scroll down to USB Printing and uncheck the checkmark. Then restart Cura.