Any way to make a negative of an stl file?

I’ve got a bit of resin laying around and I had a thought that I could just print a mold out and use that to make a resin copy. I’m sure I could find specific files that would be like the negative of a print, but is there a way to easily make a mold out of any file? Thanks for the help. http://ift.tt/2cEVRji

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