Simple parts that snap together to make a geodesic dome or sphere. Can be made with PLA, but PETG is less brittle and works better. Roughly 16 inches in diameter.

bracketa always connects to a 5 point hub. This is the pink part in the dome photo.
bracketb is the borders around completed pentagons and hexagons. Brown part in the dome photo.
bracketc is the inner parts of full hexagons. Grey part in the dome photo.