An article of manufacture comprising: a filament for use in 3D printing wherein the filament comprises an amorphous, thermoplastic resin comprising Bisphenol Isophorone carbonate units and Bisphenol A carbonate units, wherein the Bisphenol Isophorone carbonate units are 30 to 50 mole percent of the total of Bisphenol A carbonate units and Bisphenol Isophorone carbonate units in the amorphous, thermoplastic resin, and wherein the amorphous, thermoplastic resin has a glass transition temperature from 165°C to 200°C, wherein the glass transition temperature is determined as described in the description; wherein the resin comprises: (a) a copolycarbonate of Bisphenol A carbonate units and Bisphenol Isophorone carbonate units, and a Bisphenol A polycarbonate homopolymer, or (b) 95.5 to 99.5 weight percent of an amorphous, thermoplastic resin comprising (i) a copolycarbonate of Bisphenol A carbonate units and Bisphenol Isophorone carbonate units or a BPI polycarbonate homopolymer, and (ii)optionally a Bisphenol A polycarbonate homopolymer, and 0.5 to 4.5 weight percent of a high viscosity silicone having a kinematic viscosity from 600,000 to 20 million centistokes at 25° C, based upon the combined weight of the thermoplastic resin and the high viscosity silicone in the filament, and wherein the high viscosity silicone is immiscible with the thermoplastic resin. a filament for use in 3D printing wherein the filament comprises an amorphous, thermoplastic resin comprising Bisphenol Isophorone carbonate units and Bisphenol A carbonate units, wherein the Bisphenol Isophorone carbonate units are 30 to 50 mole percent of the total of Bisphenol A carbonate units and Bisphenol Isophorone carbonate units in the amorphous, thermoplastic resin, and wherein the amorphous, thermoplastic resin has a glass transition temperature from 165°C to 200°C, wherein the glass transition temperature is determined as described in the description; wherein the resin comprises: (a) a copolycarbonate of Bisphenol A carbonate units and Bisphenol Isophorone carbonate units, and a Bisphenol A polycarbonate homopolymer, or (b) 95.5 to 99.5 weight percent of an amorphous, thermoplastic resin comprising (i) a copolycarbonate of Bisphenol A carbonate units and Bisphenol Isophorone carbonate units or a BPI polycarbonate homopolymer, and (ii)optionally a Bisphenol A polycarbonate homopolymer, and 0.5 to 4.5 weight percent of a high viscosity silicone having a kinematic viscosity from 600,000 to 20 million centistokes at 25° C, based upon the combined weight of the thermoplastic resin and the high viscosity silicone in the filament, and wherein the high viscosity silicone is immiscible with the thermoplastic resin. (a) a copolycarbonate of Bisphenol A carbonate units and Bisphenol Isophorone carbonate units, and a Bisphenol A polycarbonate homopolymer, or a copolycarbonate of Bisphenol A carbonate units and Bisphenol Isophorone carbonate units, and a Bisphenol A polycarbonate homopolymer, or (b) 95.5 to 99.5 weight percent of an amorphous, thermoplastic resin comprising (i) a copolycarbonate of Bisphenol A carbonate units and Bisphenol Isophorone carbonate units or a BPI polycarbonate homopolymer, and (ii)optionally a Bisphenol A polycarbonate homopolymer, and 0.5 to 4.5 weight percent of a high viscosity silicone having a kinematic viscosity from 600,000 to 20 million centistokes at 25° C, based upon the combined weight of the thermoplastic resin and the high viscosity silicone in the filament, and wherein the high viscosity silicone is immiscible with the thermoplastic resin. 95.5 to 99.5 weight percent of an amorphous, thermoplastic resin comprising (i) a copolycarbonate of Bisphenol A carbonate units and Bisphenol Isophorone carbonate units or a BPI polycarbonate homopolymer, and (ii)optionally a Bisphenol A polycarbonate homopolymer, and (i) a copolycarbonate of Bisphenol A carbonate units and Bisphenol Isophorone carbonate units or a BPI polycarbonate homopolymer, and (ii)optionally a Bisphenol A polycarbonate homopolymer, and 0.5 to 4.5 weight percent of a high viscosity silicone having a kinematic viscosity from 600,000 to 20 million centistokes at 25° C,