Magnetic Filament Monitor

The Duet3D Rotating Magnet 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 stepps
• 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.

Kit Only.

The monitor is only as a kit of parts and the housing needs to be printed. Details are here: Version 2 magnetic assembly and housing

It comes with a connector pack with the Molex-KK-style housings and crimps to connect the monitor to the Duet.

Documentation.

The filament monitor is easy to setup and calibrate to your filament: Setting up the rotating magnet filament monitor.