Filament Guide/Sensor for Anet A8

**Update:** (29 Mar 18) I tried mounting the sensor shown in the photos this morning. It was a tight fit on the frame, but it worked. What didn't work so well was pulling filament through it when the extruder was at one end of the carriage or the other. The sensor really wants filament to pass straight through, with no bends nearby. A redesigned frame that holds the sensor higher and a smaller filament guide underneath that constrains lateral movement near the sensor might be in order.

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