Fort Emplacements and FDM: making Castle Doctrine How I made Castle Doctrine, a 1:1 scale fully 3D-Printed American Revolutionary War era cannon. Read More 1A2A3D, Sculpture, 3D PrintingMac PierceJanuary 23, 20233D Printed Guns, 3D Printing, 1A2A3D, Castle Doctrine, Welding, Sculpture, Somerville MA, Fort Independence, Artillery, Cannon, Guns, 3DFA, Prusa i3Comment