The InFiDEL is a cheap (< $5) filament diameter sensor intended for use with FDM 3d printers. rev1A has revised tracing, GND and reduced vias.

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ReferencesQtyDescriptionMouser
R111k Resistor R0402667-ERA-2VEB1001X
R514k7 Resistor R0402667-ERA-2VEB4701X
R319k1 Resistor R0402667-ERJ-2RHD9101X
C1 C2210uF Capacitor C040281-GRM155R60J106ME7D
R4118k Resistor R0402667-ERA-2AEB183X
R2136k Resistor R0402667-ERA-2ARB363X
LED11LED LEDC1608X35N_FLAT-Y604-AA1608SURSK

infidel

A modified version of an inline filament diameter electronic circuitry This version has been somewhat rewired with fewer vias and all GND signals are connected. Geometric placement of the components has been maintained with the original version https://kitspace.org/boards/github.com/drspangle/infidel-sensor/