Hi No problem for me, i launch printing from SD gcode file with pronterface. After the job is launch i click on disconnet and remove the USB wire from my laptop. The printer don't hang. I have a lot of problem with the ormerod web server so it's the only way for me to print without laptop always connect to DUET card. I think i try to test to manage ormerod with a WIFI raspberry Pi and Octoprinby sourceperl - Ormerod