Hi,
the only thing I'm missing on my UM2+Ext is a way to keep track of how much filament is left on the spool.
Can you implement a counter in the firmware that keeps track of how many meters of filament were used?
I know, the counter has to be manually set when you change the roll of filament, and I won't be super-accurate, but it will be much better than nothing (what we currently have).
The counter should be visible either permanently while printing, only for the first 30 seconds when a print is started, or only in some advanced service-menu.
If I start a print, the firmware could ask: "It seems there is too little filament left, please watch out, and change the spool mid-run!".
Or it could pause the print, when the condition "FilamentConter - safetyMargin <= 0" is reached. Currently, when I run out of filament over night, the print is ruined, because the printer can't detect when the filament runs out. (This would be another good add-on that Ultimaker should offer: "detection of 'end of filament' with photodiode near the geared feeder".)
Thanks!