Effects of accelerated aging on the appearance and mechanical performance of materials jetting products

•The long-term performance of 3D-printed bilayer polymer structures shows dynamic appearance variation because of the aging effect.•The changing trend among glass transition temperatures over time is similar and regardless of surface finish.•Up to 49% more elastic modulus and 4 to 15% higher glass transition temperature due to aging are recorded.•The maximum variation in mechanical and physicochemical properties is observed following 58 days of accelerated aging.•Magenta and black photopolymers exhibit the lowest and highest performance during accelerated aging, respectively.