This hobby gearmotor is normal and cheap, its rotating speed and torque is ideal for hobby electric screwdriver.

All you need to do is designing a connector in Tinkercad and printing it out.

The connector has a hole on each end. One is for the gearmotor, another is for the screw bit.

Supplies

Hobby Gearmotor

Screw Bits

Batteries or USB Charger

Step 1: Design in Tinkercad

The size of your screw bits probably not the same as mine. So I did not upload the printing file of my connector, you need design one by yourself.

Very simple design, not much to say.

But a notice. If you want to put screw bit in the hole, the size of the hole should be a little bit bigger than the size of screw bit.

So is the hole for the gearmotor.

The connector requires strength.

Just print it with 100% infill , such a small piece costs little material.

The working voltage of the hobby gearmotor is 3-6V.

If you use AA or AAA batteries, you can use 2,3 or 4 of them. The speed and torque will be different under different voltage.

Or cut a USB cable and connect the gearmotor with a charger(5V). It's more economical.

There're two simple ways:

1.Switch the positive and negative wires of gearmotor.

2.Swtich the connector to another side of the gearmotor.