Gear Actuated Filament Marker
By Ubermeisters
Free
It's free to download
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Gear Actuated Filament Marker
By Ubermeisters
Simply spin the large gear, or hook it up to a motor.
This is designed to accommodate normal sharpie markers, but has never been print-tested.
Designed for 3mm filament (may work with 1.75mm?).
Free