The Duet3D Filament Monitor accurately senses filament movement to detect clogs, filament run out and other extruder issues.

The Duet3D Filament Monitor very accurately senses filament movement. Connect it to a Duet 2 or Duet 3 and the controller will use the indicated movement to determine a wide range of extrusion issues including:

Filament run out Extruder skipping steps Nozzle starting to jam (causing skipped steps or grinding) Filament beginning to grind in the extruder

It does this so accurately because it is effectively an extruder in reverse. The filament movement rotates a custom machined hobbed magnet assembly; the magnet rotation is sensed and constantly reported to the Duet. This method has proven extremely accurate across a wide range of filaments – frequently capable of pausing the print before a filament jam or other issue has already caused the print to fail.

Both versions include a connector pack with the Molex-KK-style housings and crimps to connect the monitor to the Duet board.