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I used 3%, but if you can find a stronger concentration it won't take as long.
Proximity Sensor with 2N7000 mosfet
Super Capacitor Battery for Mouse
Self Aiming and Engaging gun
How to Draw Constructing: For Makers
Sketching & Drawing Lessons
Dollar Bill Origami- Shirt and Tie
Diffused Glue Stick Lamp
The Nova—A DIY Oculus Rift!
How To Build Your Own Chemistry Laboratory From Scratch and an Easy Experiment to do with it!
DIY Electric Lockpick
Watermelon Drink Dispenser/Keg
LASER diode driver
DIY CNC Router Plans : How to Build
Frankenstein Laser Engraver
Woodturning with a drill press
Build Laser Cutter
self targeting laser turret
The Moon Machine
Easy to build CNC Mill Stepper Motor and Driver circuits