For work you will need: Plastic pencil case (sold at any stationery store), motor, power supply (phone charger), drill and screwdriver, switch (button), soldering iron and accessories, ballpoint pen.
Step 1. Take a motor and solder wires to it.
Step 2. We take a pencil case and drill a hole on the back so that the wire from the power supply passes freely.
Now on the pencil case we mark the hole for the switch and solder with a soldering iron according to the markup. We try on the switch, it should sit tightly.
Step 3. Insert the motor into the pencil case, insert the cord from the power supply and connect according to this scheme.
Now disassemble the ballpoint pen. We need only a rod.
We cut off a piece so that the rod is put on half the drill and the motor.
Finish. As a result, we got such an engraver.
Instead of a drill, you can put on any nozzle.
Wishing everyone good luck! : wink: