It's a companion cube to assemble. It had a "bouchon" where you can put 2 little round battery, a LED and a little interuptor. I have disigned it to be print in POLYJET, but you can try to made it with FDM process. GL ps : i hav'nt disigned the cube, i have juste "cut" it in little parts to assemblePrint all parts (8 x "coin", 12 x "arrete", 6 x "petit coeur", 1 x "corp", 1 x "bouchon") Buy 2 little round battery, a little on/off interuptor and a LED. Put and connect all this component in the "bouchon. Enjoy