Filament Runout Sensor (Ball bearing)
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Other projects: https://www.instagram.com/engineeringns/ This sensor employs two precision ball bearings to prevent wear and tear, also allowing filament to be fed from both directions so the printer can automatically eject it once a runout condition is detected by the switch. Bearings: 3mm inner diameter, 8mm outer diameter, x 3mm thick 5mm inner diameter, 8mm outer diameter, x 2.5mm thick https://www.amazon.com/5x8x2-5mm-Rubber-Shielded-Bearings-MR85-2RS/dp/B019I3PGWG/ref=sr_1_3?ie=UTF8&qid=1546484223&sr=8-3&keywords=5x8x2.5
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