This is a custom lightsaber that I designed and made in TinkerCAD. It uses the base geometry of 3dprintingworld's collapsing sith lightsaber (Darth Vader's lightsaber) and so you should print the blades from his page.

Using TinkerCAD, I removed all of the details from the lightsaber and started adding my own. Some are custom-made, but some were used from the original model, only adjusted slightly.