US Patent 11084220 Electrophotographic multi-material 3D printer

An electrophotographic three dimensional printer system, including at least one electrophotographic (EP) printing module employing multi-material EP printing technology. The printer system may also include one or more additional printer modules employing different patterning and deposition technology, such as powder bed and jetted binder technology. The EP printing module may be used to create a 3D object derived from a composite toner material that may comprise an engineering material treated with a triboelectric material. The composite toner material may be designed to undergo a post printing treatment wherein a triboelectric material may be separated from an engineering material and the engineering material may undergo a change.