Interlocking Heart Puzzle

richgains Printable Interlocking Puzzle #1 made even easier by adding a design. I wanted to make a puzzle for a little girl, but this seems to be far to easy...
Maybe I should name it possible heart puzzle in contrast to the almost impossible heart.

I added the SCAD file, so you can make your own derivation with other designs. I would be interested to see them. And I would be even more interested to see how you printed this ^^