I think Disney is getting ahead of this thing (3D printing and patents). Right now, fans no doubt make the best stuff. Anovos puts out a pretty quality product, but it is highly expensive. Most people are not going to spend between $2K and $4K on a costume, so that market is really small and there is not enough profit there to go after.
As costs come down and quality increases for 3D printing, I can see a day where Disney can put out high quality pieces for a fraction of the current prices. When this happens, Disney will start to care a bit more about what is now a small and high end market. Of course, at that point, the entire marketplace will be different. Right now, the fan community leans primarily on casting. I have 3D printed a number of parts of my costume, but 3D printing is still too expensive and low quality for most parts. Let's look at some Shapeways pricing:
Jet Pack...$2,780.00
Helmet...~$630.00 for all parts
Armor...~$1,200.00 without the knee pads
Gauntlets...$700.00
Pulce Sidearm...$355.00