Created as a box for "Almost Impossible Heart". It's essentially an import of the heart shape, which is then slightly oversized and cut out of the top and bottom halves of a box. But it is parametric, and the OpenSCAD file can be used to import other STL files instead. Could be fun as a Play-Doh mold. Can adjust: -height -width -depth -size of bevel on top -size of mating lip -which .stl file is imported into the file -amount to oversize the .stl cutoutTo adjust it, edit the .scad file. The adjustable variables are listed at the top of the file. You can adjust "part_layout" to be either both pieces open for printing, closed, or spread apart slightly for general fit checks. Place whatever .stl you want to import in the same directory and replace "heart.stl" with the name of your part. (also remove the "scale" directive above it--this was needed specifically for the Almost Impossible Heart Puzzle) Compile and Render with OpenSCAD, then Export as STL.