A transparent thermoplastic engineered polymer.
It is also called acrylic or acrylic glass and may go by the brand names of Plexiglas, Acrylite, Lucite, and others. It is strong, impact-resistant, and UV-resistant.
In additive manufacturing, PMMA is used as a stock material in material extrusion processes and as a powder in binder jetting and powder bed fusion.
Although acrylic materials can not be used as a photopolymer needed in material jetting and vat photopolymerization, several acrylic-like materials have been developed for those processes.