Printable glasses for kids with firm frame and hard enough legs.
Can be used with prescription glasses too!
Print frame_rX.stl, leg_left_rX.stl and leg_right_rX.stl with 0.25 mm layers. If you can do 0.1 mm, good for you. Depending on the filament quality, it's good to use 2 or 3 solid perimeters (solid layers) and at least 20 % infill.
ABS is highly recommended and you should apply some sanding and finishing where frame and legs touch the face.
Use 3 x 10 mm self tapping screws to mount the legs. No nuts are necessary and will only add weight.
Current version is Frame R6 and Legs R5 for smaller children. Use 10 years edition for pre-teen hipsters. ;-)