Valentine Heart

The original Secret Heart (44579) was optimised for Makerbot, and just worked, but I had problems printing on anything else. They published the OpenSCAD (thanks), but even after updating for current version and lots of tweaks I had problems, not least of which was that Simplfy3D refused to properly bridge the top unless you make the walls really thick.

I have re-designed this from scratch (twice now), and the OpenSCAD file is included.

The main problem with anything that has moving parts i