u/tototwa

I tried this with brass. I used the PLA for meant for printing RC airplanes. The pre foamed PLA burned out much better than regular PLA. I’m very happy to learn how well this worked. The imperfections were on the PLA model itself. I just hot glued a piece of foam on the bottom and then spray painted it with a couple heavy coats of high temp spray paint. Then put green sand around it. Brass completely burned out the PLA and left great detail. IMO very successful experiment. The second pic is after very brief touch up with wire brush.

This was only my 3rd melting session ever. Still a novice at casting. Learning so much each time.