This is a quick release lever that I designed for my filament drive ( http://www.thingiverse.com/thing:7113 ). It may also be useful elsewhere.Print the parts with support material on. There is an STL with both of the parts in it if you want to print them both at once. If not, you only need support for the lever.Remove the support material.Put the pin through the lever. Put a bolt through the pin and attach the bolt wherever it is supposed to go