Now this is only an idea but possibly a very good idea. I'm sure many throwers have a few discs that they can't throw or don't enjoy throwing because of a cracked or broken plate. Many discs you can't buy replacements plates (Denfi you can but expensive. Gill may if you contact them) which means a discus can go from your competition discus to a training discus or spare parts.
My idea is to use a 3D printer to make possibly cheap replacement plates. With 3D printers coming down in price and many people having them in their own homes all it may take is getting the measurements of different plates, entering them into a program and you'll have replacements plates and discs that can be thrown again.
I'm looking into this to see if I can find anyone that could help but if there is someone in the throwing community with access to these resources it could be an interesting project to look into.