Re: Filament Measuring Device
instead of the filament dragging on the contact I wonder if you could use bearing on one side and this Dial indicator roller on the other to contact the filament.
Yeah that seems like a much simpler solution. You could probably get away with just a ball or half circle tip if the filament is running through a v-groove, although that makes zeroing more interesting (might want a 1.75mm gage pin). Indicators put out the same output and have a natural pressure from gravity.
There is already some existing software that takes that output through a com port although your solution might be cheaper in the end.