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Standalone filament alarm/sensor

Buzzer-alarm for when you need to change spool.

3D printer parts and enhancements

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This started out as a quick'n'dirty hack for my printer but I've found it really useful so far.
It's a printed base with a battery, buzzer, switch and some PTFE tubing.

Your filament will run in the short PTFE tube and along the way holding the switch open, disconnecting the buzzer circuit.
As soon as your filament runs out/passes through completely, the circuit will close and the buzzer will start singing the song of it's people.

This instantly lets you know it's time to hook up a new spool!

I know you could do a more advanced version and hook it up to your controller but this is a simple add-on that works on any printer without any hacking, just put it between your spool and extruder and you're good to go!

Check me out at:
Youtube: http://www.youtube.com/c/MrCrankyfaceProjects
Instagram: https://www.instagram.com/mr.crankyface/
3d hubs: https://www.3dhubs.com/malm%C3%B6/hubs/mrcrankyface
Patreon: http://patreon.com/Mrcrankyface

Materials and methods

Hardware needed:
9V battery
Some wire
PTFE tubing
2x M3 screws for the switch



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54ca85525c6283fa5a64dfac07f186cf?default=blank&size=40Aggravator added this to the Build collection ago
E6a45e6772c9c6ab7c74c06a2e1f9579?default=blank&size=40Aim23 added this to the Filament collection ago
F002b4d63499f6c5f6f84ae64ac3c1b8?default=blank&size=40dirt.rocket added this to the Stuff collection ago
Mini engineerdog headMichael commented ago

Nice design, thank you for sharing!

You might be interested to check out my design approach for this problem. My low filament alarm is super loud and also has bowden tube and oiler attachments! Check it out here: https://engineerdog.com/low-filament-alarm/

Mini avatarMrCrankyface published this design ago