Based upon Adi Gallia lightsaber as seen in the movies and Clone wars.
My idea is one universal hilt and multiple pieces for every taste.
As for the blade i used the amazing model from 3D Printing World available on Printables here: https://www.printables.com/it/model/3721-collapsing-lightsaber-removable-bladeSimply print the parts and insert them into the hilt.
If you like the design and have other propositions for a custom lightsaber consider contacting me! ;D
PRINTER SETTINGS:0.15 layer height10/20% Infill
Use Brim on thinnest pieces.Depending on your printer capabilities you might need some supports (i used Orca Slicer for custom supports).
As for the blade much depends on your printer settings.In my case i used 2 walls and brim for all pieces while for the first one a raft.