Sponge Holder

Fusion 360 link for editing: http://a360.co/2vk4qIT

Holds a typical sponge at a 45 degree angle.

I put a small incline on the bottom so rocks/marbles would stay towards the back. This helps hold it in place, and makes it a bit fancier.

I made some flat spots on the corners for some silicone non-slip feet to keep it in place and allow air to dry the bottom of it.