For example, additional sacrificial binder materials include a thermoplastic wax, a synthetic microcrystalline wax, a crystalline polyethylene wax, or other wax-like materials that may have a melting point in the range of about 50??? C. to about 200??? C. and a sharp melting/crystallization temperature of less than about 5??? C. Other examples include waxes such as carnauba wax, candelilla wax, ca