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Water Temperature Monitor
ECG Display With Arduino
Solar Powered WiFi Weather Station V3.0
You could also wire the switch poles to be between the +5v and a GPIO switch on a raspberry pi. There are plugins for Octoprint that allow you to use this information to pause the print.
Edge Lit Bathymetric Map Using LED Standoffs
Portable Fine Particle Measurement
Delorean DMC-12/BTTF Time Machine 3D Printed RC Car
Cyclone Dust Collector by 3D Printer
All My Hearts, Combination Puzzle Box
Saturn V Lamp
How to Make a Kids Wooden Climber (Pikler Triangle)
Whole Grain Wheat Bread
How to Make a Picoballoon
Best Smoked BBQ Pork Ribs