Simple 1.75 mm filament-out sensor

Closes a switch if your filament runs out before your print finishes.

3D printer parts and enhancements

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Description

Update: see https://www.youmagine.com/designs/improved-filament-run-out-sensor for a better design...

Simplest possible filament out sensor- the filament keeps the switch lever pushed down. When the filament runs out the lever pops up and contacts open/close. You can wire it to a switch input on your printer's controller board to pause the print until you change filament and restart.

The switch fits comfortably into the slot. The screw holds the switch in place. Insert a piece of filament, push the switch into the slot until it clicks, then tighten the screw to hold the switch. Pull the filament out and you should hear the switch click. Put the filament back and the switch should click again. You're done. Wasn't that easy?

The design can easily be adapted to any lever-type microswitch you happen to have handy.

I designed this in two pieces- the main body sits on top of my printer's 1" PIR foam cover. Antirotation spikes keep it from turning. The nut goes on inside the printer enclosure. This device creates only a tiny bit of friction so your extruder should not have any trouble pulling filament through it.

Materials and methods

Almost any filament should be fine. No support material needed You will need an M4 or 6-32 screw to hold the switch down. And you'll need a microswitch with a lever, though you may be able to get away with a switch that has no lever.

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Comments

884da937c3003f768482a1326c6467b2?default=blank&size=40enry68 added this to the Printer 3D collection ago
096ea02bb238dcf181a7ea55137140cc?default=blank&size=40Daniel Eaton added this to the PrinterSetup collection ago
2e11e35458874273c718d7ccaf3ffb74?default=blank&size=40Thomas Pakh added this to the To-Print collection ago
D3dee1c000d796a9bbafed1875d2a22e?default=blank&size=40rabbit added this to the 3d printer stuff collection ago
Mini monimweb1Alain Ducros added this to the frein fil collection ago
Mini monimweb1Alain Ducros added this to the guide fil collection ago
Mini gold hands croppedMark Rehorst published this design ago