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Flash Cotton (Nitrocellulose)
Dry Cell Electrolyser
How to Make a Cheap, Portable Magnetic Stirrer
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Water Turbidity Sensor
Inexpensive, easy to build, peristaltic pump
DIY Logic Gates
Make a MakeyMakey Wire Maze
Arduino Automatic Fish Feeder
Gradient Rain Gauge
How to get started with 3D printing
Bubble display is no longer available, and there are no other 4 digit 7 segment displays the same size that I could find. I have it built except for the display, does anyone know where I can get a similar sized display?