
PLA Lost "Wax" Casting
TL;DR: It works, try it.
I finished off the furnace with another couple of pounds of refractory cement, and let it dry for a couple of days, then fired it slowly over a few hours to burn out the rest of the water. Things looked solid, so the next step was to try and cast something. Of course, my first thought was to “forge” some currency, and the results are below: