Sponge Holder

thingiverse

Fusion 360 link for editing: http://a360.co/2vk4qIT Hold a typical sponge at a 45-degree angle. I position a small incline on the bottom so rocks/marbles remain towards the back. This setup helps hold it in place and adds a bit of flair. I create flat spots on the corners for silicone non-slip feet to keep it stable and allow air to dry the bottom of it.