This is the lightsaber you're looking for. Search your feelings. You know it to be true.
This is a lightsaber design, I've been working on for a long time. It is technically identical to the 1980 The Empire Strikes Back and 2015 The Force Awakens movie prop. I've used the dimensions of the 3 cell Graflex flash handle as a reference which was the original lightsaber prop.
The model is made of 36 separate parts, all of them support free, optimised for FDM printing and they can be assembled without any glue. I've attached highly detailed printing and assembly instructions. I've also designed two display stands for the lightsaber.
The models are optimised for and were tested on the Ultimaker 2 so to achieve the best results you are suggested to use a printer with a similar accuracy.