The measurements are different to standard boxes because of the way the
heart is modelled. It is made from an ellipse, which is rotated, cut in half
vertically and then mirrored.
The “Length” measures between the two
sharp corners of the heart. The width is calculated by the program to match the
rotation (tilt) and shape of the ellipse. (Think of the shape as the ”Body Mass
Index” of the heart).
The box consists of a base and a lid. Each
part has two heart shaped “caps“: the smallest one goes on the inside, the
larger one goes on the outside to conceal the ugly-looking glue flaps. It‘s
easiest to glue the heart-shaped caps instead of the glue flaps. The ”Paper
Thickness” parameter is only used for making the outside hearts larger then the
inside.