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Excellent solution btw, i have been messing with these, but since you cant print stresses into the object, you have to do it in two parts, neither this approachhttp://www.thingiverse.com/thi... nor the lock brickhttp://www.thingiverse.com/thi... approach works well at the scale i want.
Why not make the spring a part of one of the scissors? That way you cant lose it.