In this episode (S2-E65) of the Art of Boat Building, Boat Builder Bob Emser show how he cast a bronze gooseneck using the Lost PLA method. Lost PLA is much like Lost Wax casting except PLA filament from 3D printed parts is melted (lost) out of the mold and then replaced with bronze. The bronze gooseneck is what attaches the boom to the mast. In addition Bob makes the tapered boom out of Sitka Spruce.