wedding heart cube puzzle

This is not a day-before project, do your project start a month before you need it! Weight 88 gram (complete). Do not sell, check patent situation before. Also, it's uncool to buy 'homemade' things for your girl. Better to make it yourself.
There is a mass produced version sold. This is _not_ the production data of the mass production, I'm not the producer. This data has less quality, less precision. This STL data is designed for FDM print and not moulding.

How to make:
Print as shown, do not rotate in slicer. There is a version with relief for paint and without relief for stickers.

core 1 pcs:
use the unsplit version. Print without support, inside must not been support material. check for good printbed adhesion.
clean the small holes to 3mm diameter. Come with a M3 long screw from outside thru a 3mm hole, insert from inside a M3 nylock nut and pull the nut in position. Do with all 6 nuts.
Split version: I do not recommend to print. At outside there is a alignment marker for