One of my seatbelt release buttons on my 1995 Volvo 850 broke so I needed to find a replacement. When I saw the prices of used buttons I decided to just print a replacement instead. Its not perfect but it does the trick and costs next to nothing to print.
I decided to make my version slightly thicker than the original by filling in the centre underside. This makes for a stronger part and makes the print cleaner when printing on its edge.