About this 3D model
This is a light saber for giant Lego. Just search "Giant Lego" model ,you can find some models for it, or you can also print the "keychain". I think it is quite cool. The inside parts of the saber are led strip, a switch, and a 12v little battery. The switch is smaller than 11X6 mm. You can also use the battery seat. Hope you will like it.