Well the good news is that resin based (SLA) 3d printers are getting cheaper and bigger at the same time. A decent sized printer can be had for around $200 now. Not only that but resin printers print an entire slice at a time meaning they are quickly becoming faster than FDM style printers. They are very close in build size to being able to resin print an AR15 lower. I still have serious doubts as to whether a 3d printed lower is just a foolish exercise or a budding Darwin moment, but resin printing produces very detailed and relatively dimensionally accurate prints something I can't get with my PLA based printer.