I have several lcd 16x2 panels and can easily wire them up for an arduino, some have buttons (5 or 6), but none have the 20 position rotary encoder. I saw a gcode line that issued 'start print' to the display. Can you use an lcd without the 20 position switch? Does it have a default display that shows info or print updates without user input?
How about push 5 buttons to scroll instead of the rotary encoder? Could it use them to scroll and select options?
I dont having experience with marlin or the firmware so I don't know if this would be an easy task or a waste of good print time.
Thanks,
Ed