Can someone explain to me exactly what resin is? I know it's a form of liquid polymer, that when hit with light/laser hardens into a plastic material. However, does anyone know how the resin is produced? Is it possible to make your own resin at home, or are too many dangerous processes required?

One of the benefits of filament printers is that you can basically reuse your filament, and practically create your own. I'd like to know if there is an affordable way of obtaining resin (perhaps by creating it yourself). I love the resin printers, but I hate how I am always going to have to rely on others for the raw materials.