Aergo (Look) extensions have been out a while now. They are a fairly neat concept, but for most of us the fact that we would have to deal with LOOK is a dealbreaker when you need very specific replacement parts. The "next" thing in aero extensions is integration with the forearm, another few months and we'll have fairly readily available off the shelf solutions (Testing Drag2Zero's, they are pretty nice to not be custom) that will work with non-proprietary cockpits.
A lot of the new 3D printed parts / drops look good, some (like the madison bars) are pretty single purpose, but that's fine at high level. It's exciting as 3d printing tech starts trickling down. We're still a few years away from it being accessible to mortals, but big steps are being taken every year (I have actually seen some new metal filament that is supposed to work on home 3d printers fairly well, that's huge!)