BD-Width Filament ⌀ Sensor

The BD-Width, invented by the talented Mark Yue, sits on your filament path and continuously measures diameter and movement using a CCD linear sensor. This enables real-time flow rate compensation — no more over/under-extrusion from inconsistent filament, higher accuracy on fine details — and reliable jam/runout detection that pauses your print before it fails.

Specs

• Width accuracy: ±0.01 mm
• Connection: USB or I²C
• Firmware upgradeable via USB
• Zero calibration needed — plug in and go

What's included

• BD-Width sensor
• 1.3 m I²C cable
• 1.5 m USB Type-C cable

Fully transparent filaments can't be measured for width, but motion tracking still works — so jam and runout detection remain functional even with clear materials.

Links: GitHub · Wiki