Is this like a trip odometer, or can it count down. Actually, for at a glance info, i would prefer to know ~how much filament is left over so i know if the print job i am about to start will get done... (slap 2 on, one that counts up and you can rest after each print job and one that you set when you add a new spool so track total amount left). This would let you know per print your approx amount used and also avoiding printing when there isnt enough filament.