This is probably the most versatile jaw design I have come up with so far. There is more than meets the eye in this shot.... scroll down to see how this works!

The jaws are made up of a row of alternating fingers:

The fingers are interlocking so the jaws can close past one another:

Letting you hold small stuff...

Medium stuff...

and Large stuff, this motor is about 1" in diameter:

The best part is, you can still hold a PCB:

These will be available to download for 3d printing at http://www.stickvise.com/hacks/stl-downloads