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Laser Cut Settlers of Catan Board
CO2 laser that cuts sheet metal
Laser engraver with arduino
Any remote controlled car using Arduino
Mini CNC Plotter - Arduino Based
Cheap Arduino Controlled 3-Axis Pen Plotter
Control DC and stepper motors with L298N Dual Motor Controller Modules and Arduino
Build your own Mini Arcade Cabinet with Raspberry Pi
Single digit numitron clock
Pocket laser engraver.
Multi key + Bike Tools + USB Drive + Bottle opener + Screwdriver (~$15 ~1hr)