Super simple filament jam and presence sensor - inline option / cheap switch option
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This is a very basic implementation to allow this fabulous sensor to be placed inline, and to use the micro-switch only.
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Frankly I dont know why this design by Martin_au isn't the most popular mod for all 3D printers.
It detects jams and filament runout without needing fancy LED motion detectors, special code etc., and only uses one microswitch
For my remix I added the ‘standard’ collect clip thread (10mm) so it can be placed inline.
I added a spacer to allow the micro switch to be used by itself (can be sourced cheap and easy from many sources)
EDIT July2023 - I've added another part to allow the use of the larger microswitch.
I added holes to allow a tiny pull tie to secure the wires
I just glued my switch to the spacer
Some care is needed with bending/cutting the activator bar on the switch to get it to function correctly without snagging, similarly the adjuster screw needs to be set just right to keep the switch closed when filament is not jammed.
Note the wires Ive soldered are in the NO configuration - for my Klipper implementation I actually moved the red wire to the centre tab so it will operate correctly using NC method.