A box that holds a scale removal tool.

thingiverse

I keep a handy calculus remover with me at all times, which can sometimes prove to be a bit of a hassle to carry around. To make storing it easier, I built a special holder for the device. The storage container has a rectangular cutout that allows water to drain out, making sure the tool stays dry and functional even when used in wet conditions. I'm actually using this calculus remover right now, and I have to say, it's been a huge time-saver.