Low Filament Alarm
thingiverse
There's a lot packed into this compact alarm: An On-Off switch, mechanical limit switch for detection, LED light indicators, piezo alarm, and Teflon tubing for smooth filament flow. The following components are needed: (1) Micro Switch: ultimachine.com/content/microswitch-ss-3gl13pt (1) Slide Switch: robotshop.com/en/tamiya-mini-power-switch-2pk.html (1) Piezo alarm: ebay.com/itm/95DB-Alarm-DC-3-24V-12V-5V-Electronic-Buzzer-Continuous-Beep-Piezoelectric-/261752800917 You'll also need three LEDs, (40mm) Teflon tubing with a 4mm OD and 2mm ID, wire, and glue. This project comes in under $5.
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