The metal printing cnc won't be selling for 350, the printed parts require an autoclave to finish the parts. The smallest autoclave you can get is around $15,000-$20,000. The parts need to be baked in an oven and air pumped out of it. The problem with printing those parts are that there are air voids trapped in the print, additional metal material is added after. The gold color dust you see in the video is bronze or brass i forget which one. when heated its printed parts suck all bronze in to the air voids and making the part as one. Going this route is way more expensive
I'm designing a metal deposit laser cnc for this area too. Should have one up and running by the summer. The way it works is it shoots fine aluminum dust in to an helium air stream, the laser heats up the metal and the aluminum dust fuses to the area where the laser beam hits and keeps building it up layer after layer. much like a plastic 3d printer would do but using a laser. I'm trying to target the price around $3,000 and under for the complete setup for a 2'x4' machine, than you guys can actually print out lambo engines lol