In looking around for images of Ben Skywalker's lightsaber, there doesn't seem to be any agreement on what it looked like. I guess since he only appears in a handful of books there's no iconic image of his lightsaber out there. The models I liked the best had elements from both his dad's (Luke Skywalker) and his mom's (Mara Jade) lightsabers, so I borrowed from those two designs.
I started with the lower half and the emitter of CaseStudyno8's Lukeskywalker Lightsaber. I hardly touched the pommel and midsection - just added some new holes for more buttons. (Buttons are cool - see below!) I modified the emitter a bit and added more pieces to it. Then I created the middle grip using alternating large silver and smaller black rings like I used on Mara Jade's lightsaber.
Then I stuck a bunch of buttons on it because, well, lots of buttons on a lightsaber are cool. Totally useless, but still cool.
You'll need three small buttons, inner and outer, two large grips and three small grips. Everything is in the orientation that I printed it in. The Switch Top will need supports, but that's the only piece. I also needed a raft to keep some of the smaller pieces on the build-plate.