Adjustable Wrench

Here is an adjustable wrench I made a while ago in blender, after seeing [Enginerds Adjustable Wrench Challenge](http://www.thingiverse.com/thing:12740). I used tbusers files as a base, modifying it to have a square channel for easier printing. Once printed out it works well on loose things, but on tight things the plastic isn't strong enough.

I have modified the Wrench_Arm part to print upside-down, removing the need to use support material, however I have left the Wrench_Arm STL file as the