Optical Filament Sensor v21 with Drive Gear  for 175mm filament
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Optical Filament Sensor v2.1 with Drive Gear - for 1.75mm filament

This is version 21 of my previous design It was prepared in cooperation with dragonn models ...

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Optical Filament Sensor v2.1 with Drive Gear - for 1.75mm filament alternatives
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