are solidified into solids 38a 38b which make up solid structure while a wide variety of phase change liquids may be chosen from such as metals thermoplastics waxes styrene polyethylene and polycarbonate in this case the two liquids 14a 14b are chosen so that after being solidified solid 38b may be removed without harming solid 38a this can be done in a variety of ways for instance solid 38b may be dissolvable by a solvent which does not harm solid 38a or solid 38b may have a melting point at least 5 degrees centigrade lower than the melting point of solid 38a this is done so that solid 38b may act as a sacrificial layer and be removed from solid structure 42 after deposition and hardening have been completed this is to aide in forming an complex structure out of solid 38a in this embodiment because the two liquids 14a 14b are normally solid at room temperature they have been heated to maintain their liquid structure the droplet emitter 40 has been modified slightly to include heaters 54 in the top plate 34 to maintain the liquids 14a 14b in their liquid state until they can be emitted from droplet emitter 40 onto substrate 36 solid structure 42 is made of a plurality of layers 44 each layer being partially comprised of solid 38a and 38b a look at fig7 which is an enlargement of a portion of fig6 makes the advantages of this process more apparent in fig7 the separate layers 44 of solid structure 42 can be more clearly seen solid 38a is used to create two structures a vertical structure 46 and a horizontal structure 48 which.