One Sunday, as I was perusing the local trash and treasure market, I came across a box of old cordless tools.
The guy mentioned the batteries "didn't hold much of a charge", an understatement if there ever was one as they were absolutely ratted. It didn't worry me much as I figured I had 3 motors to have a bit of fun with.
But then I thought, why not try and see if I can plug the batteries from my good drill into these tools.
Just to put the cart before the horse a bit here, you can see my files at Thingiverse
Without further ado, here's how I used a 3d printer to up-cycle some old tools and with a bit of work, you can too.