About this 3D model

This is a design for a desk vice that could be printed with a makerbot, obvioulsy this would not be as solid a normal metal desk vice, however it should still be strong enough for many light jobs. The vice head could be shod with metal (using a couple of metal strips and a few drops of glue) to improve the usefulness of the tool. I designed it around a long metal bolt I have in my junk draw, but the design could be modified to use a commodity bolt available at a hardware store or preferably a printable threaded bolt (still trying to figure out how to make threads in Sketchup - any advice on this would be appreciated).