Invisalign braces and Vivera retainers are already 3D printed (using UV photopolymer and a laser). They just do it at a factory, because the 3D printer that ca

Invisalign braces and Vivera retainers are already 3D printed (using UV photopolymer and a laser). They just do it at a factory, because the 3D printer that can produce that level of detail/strength is terribly expensive.