Frankly, I don't see widespread aluminum fabricating for consumers happening any time soon. I suspect the best we're going to have for a while is the alumide.
Aluminum is a difficult material to form in the way a 3D printer needs to do it. It's easy to cast, and simple to forge, bend, or cut, but difficult to melt with precision or weld, and incredibly dangerous as a fine powder... as in highly explosive and burns very hot. It's one of the components of Thermite, after all. There are outfits that do it with a process called "Direct Metal Laser Sintering", but it's an industrial-grade process with industrial-grade costs.
Yes, it can be done... but you'll probably find it's going to be nearly as expensive as the silver when all is said and done, if for no other reason than the safety precautions that will be necessary.