Obi Wan Kenobi Lightsaber and Star wars light saber with mini components 3d print
Glue the two lower body sections together (body one and three,) ribs on body one and cap and buttons on top section (body2).
insert bottom, battery, assembled chrystal chamber, amp chamber and beam chamber in lower body sections.
Gently wiggle the body top on. You may have to sand down the tabs a little to encourage them to go over the rib without cracking.
Body three and two should snap on and hold it all together so you can open it later to service it or put it on display.