heh. fusion sciences, fusion reactors, fusion drives, that sort of thing. Its the only way we'll get to the outer solar system in timeframes that aren't wretched. If you ever want help writing up pseudo-science descriptions for various components of your spacecraft, I'll be your guy ;p
The 3D printing stuff can be tough with certain models. But there are tools that can be used to fix up models - namely, Autodesk Meshmixer has a suite of utilities that can help make models 3D printable.
Meshlab is another one, but this is mainly useful for fixing manifold issues or simplifying the geometry. Overly complicated models are really hard for slicers to manage.
Shapeways is a good service to use, but very pricey. An alternative option is:
You can find a local 3D printer owner that can help you print what you'd like. Most of the people here will be able to print a model thats fixed up a bit - some of them would be willing/able to go further and do mesh fixing stuff. I'm not surprised you had issues with your makerbot, either. They are a terrible company that knows full well how bad their printers and how terrible of a user experience they can create, but they've done nothing to fix it. They also took some open source innovations from the RepRap community and closed-source them. Ultimaker, MakersToolWorks, SeeMeCNC, and Makergear are the companies I know well. I've talked to several of their employees, and always been impressed. Here's a link to a comparison of a bunch of 3D printers, if you ever want to give owning a machine another shot. I own and operate a Mendelmax 2 at work.
My offer still stands open - free of any sort of charge, liability, or expectation of payback I'd be happy to try to fix any models you'd like to see 3D printed. One of the coolest things I've seen companies do is publish models of their game or media objects to be printed. SyFy did it with the various vessels from The Expanse, so I printed myself a big ol Canterbury model.
If I'm able to get a model fixed, I can send you back the .stl file so you can decide how to distribute it (if you want to distribute it - I can understand caution and wariness this early in development!)