FAQ and Troubleshooting

bCNC is not starting

Do you have latest git master or latest stable version? Do you have all dependencies installed? Do you use right python version (2 vs 3)?

My machine sometimes suddenly stops in mysterious ways

Do you have unshielded cables too close to each other? Too long USB cable?

bCNC refuses to run my perfectly good g-code

Try different g-code sender and let us know if it fails only in bCNC

Connect to motion controller using plain old terminal emulator, eg. Putty on windows, or screen for Linux users: screen /dev/ttyUSB3 115200 (to exit: ctrl+a k y) Paste the commands directly to this window

I think that bCNC sends bullcrap to my motion controller

You can use following command to connect to debug serial traffic. ttyUSB0 is real HW, ttyUSB23 is gonna be new fake device to which you'll connect the bCNC in order to intercept trafic:

interceptty -l /dev/ttyUSB0 /dev/ttyUSB23 | interceptty-nicedump

Rendering is slow and some lines are missing. Rendering burned my house down, ate my wife and druged my dog.

We know. Increase timeout in top right corner and wait.

Unicode not working. I can't open g-code with Klingon filename.

We know.