Automatic/Electric Nail Filer/Cutter
Step 1: You Will Need
A DC motor
Emery Head/Cylinder(can be found online or at hardware stores)
3D Printed connector part
Step 2: Connect and Assemble
The 3D printed piece(grey) connects the motor and the emery head.
Connect the motor using wires to the battery connector after inserting the batteries.
Voila! You have an electric nail filer/cutter.