MakerBot Print is our newest print-prepration software, which supports native CAD files and STL assemblies,
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I tried to attach the spring directly to the two scissors, but slic3r tends to make small space between the spring and the scissor parts regardless of how the model looks. propably because the spring is only 1 extrusion width wide. The result will be glued together anyway, but it tends to break at exactly that gap, so you will propably have 3 parts anyway after some use :) However, I will upload the model and stl when I got some time.
The basic idea of this clamp was to construct something that works without vitamins, but maybe I'll make one for use with regular springs sometime.
Kc is just my nickname.