This assassin's creed hidden blade was almost entirely 3D printed and it is pretty

3D Printing
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1

This assassin’s creed hidden blade was almost entirely 3D printed and it is pretty special in its mechanics. A pull on the string both extends and retracts through the use of a clever trigger mechanism.

Files are available for printing on the youtube video description.
https://www.youtube.com/watch?v=sKfRApBq9kE

2

I’d ask for source, but I know I’ll never print this thing. VERY cool design and triggering system!

3

Another type of design: http://makezine.com/projects/3d-printed-bionic-claws/

4

Here’s the thingiverse page: http://www.thingiverse.com/thing:801162