Lance Abernethy 3D printed a working cordless drill measuring 0.67 inches tall, 0.27 inches wide, and 0.5 inches long. It holds a 0.02 inch twist drill. It works. But that's not the best part. Lance is working on making a smaller one.

Check it how:

That's super tiny! Now see it work in the video below:

He told

It took me 3 hours to solder and try and squeeze [all the parts] in. The wires kept breaking off when I was trying to connect them and it was a nightmare trying to hold them in place and try to not short the battery. I have seen claims of the world's smallest cordless drill and I know mine is smaller but it's not a confirmed claim.