Lance Abernethy, a maintenance engineer, from Auckland, New Zealand, 3D-printed a cordless drill that measures 17mm tall, 7.5mm wide and 13mm long, and holds a 0.5mm twist drill. Not happy with that, he is already working on a smaller version.
Lance told 3Dprint.com:
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.