This is a simple webcam cover for a laptop.
I'd recommend printing this at a higher quality to make sure the hinge doesn't fuse together.
After taking the print off the bed, slowly bend the two sides with your fingers close to the hinge. You may feel a small pop, and the hinge should swing back and forth freely after that.
I've found that the 4mm size tends to work best with macbooks, while the larger 6mm size works for most thicker laptop screens.