I took some basic design concepts (roughly thought up) of what might work. Understanding that I needed a latching mech, some spring mech, a button, and then a way to house everything in-case it went into use; I created just that.

I began modeling with a firm design in my head and that is what the final product turned out too be. I dont know at all if this item will print successfully and I firmly believe that it wont. But you're welcome to give it a go.