I wanted to clip a cutting mat to my print bed as part of using my 3D printer as a plotter. The print bed is thick, so I needed a clip that could span it. Hence, this ugly but functional solution. You can customize it all sorts of ways, but I printed it with the bottom jaw toothy and top jaw smooth, and glued a bit of rubber from an old bicycle inner tube with Shoe Goo to the top jaw.
The default dimensions are for the DaVinci 1.0a.