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Tiny 3D-printed drill is powered by a hearing aid battery

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We've seen teeny-tiny 3D printers before, and now we're getting pint-sized creations to match. An ingenious engineer from New Zealand set out to make the world's smallest cordless drill, and the result is pretty remarkable. The tiny tool measures just 17mm tall, 13mm long and 7.5mm wide, with a 0.5mm twist drill that can pierce soft objects. Creator Lance Abernethy designed the outer shell in Onshape with a regular drill for reference, before printing it with his trusty Ultimaker 2 3D printer. It's powered by a hearing aid battery and connected with wiring stripped from a headphone cable. The hardest part, unsurprisingly, was assembling all of the parts inside, because the wires kept breaking off and threatening to short-circuit the battery. Needless to say Abernethy pulled through, giving Borrowers everywhere an ideal power tool for their next home renovation.

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