Duet3D Filament monitor hardware source files:
2 Variations:
Laser Filament Monitor (the older version was 1.7, ever version is 2.0, see the documentation for more details).
To purchase: https://www.duet3d.com/laserfilamentmonitor
Documentation: https://duet3d.dozuki.com/Wiki/Duet3dFilamentMonitor_LaserVersion
Magnetic Filament Monitor
More information coming soon.