My Magicolor 2300dl printer displays a 'Waste toner box full' message, even though I have just emptied the waste toner box.

. Remove Waste Box, Empty box, wipe down w/ dry paper towel
. Turn machine off,. Unplug power cord
. there is a blue rectangular pull knob
.above Rectangular knob @an angle R 2 notches (contain ensors)
. Take an AIR can & hold 6-8 inches & spray N2 ea. sensor
. this should clear any particles that generate a false " Full " Signal
. credit to Nightangel for getting the ball rolling. Thx

Best solution would be:
if you remove the waste box you'll see blue knob and above there is a sensor now take a look at the waste box and find the place what goes between the sensor. you should cut off one side and clean the other sides and then use some invisible tape to fix the hole. and try again.
so anyway the point is this place what goes between the sensor have to be clean. its not good idea to cut or remove the sensor at all because next time the box will be full you don't know that and it will brake your printer.
good luck