I designed this to hold a black curtain for a backdrop for my 3D printer time-lapses.

I wanted it to be as small as possible (about 6-7 grams), because I knew I was going to be printing a lot of them, so I started with the base from d34d's "C-Clamp Skateboard Mount" and then modified it using some parts from johann517's "G-Clamp". I then added a screw hole for mounting it.