Clarified unable to print over USB message for ulti-gcode
Clarified unable to print over USB message for ulti-gcode

Curahelper/Cura,Curahelper/Cura,hmflash/Cura,fieldOfView/Cura,fieldOfView/Cura,ynotstartups/Wanhao,hmflash/Cura,ynotstartups/Wanhao