This is a door handle for a 8.5 mm by 8.5 mm bolt. I used a M6 thread cutter for the hub screw.
Made this as an replacement for a door knop, which was hard to turn, especially if your hands are wet.
Used support "touching buildplate" to print it. The red version on the picture broke once (after about a year) and I reprinted it with higher infill percentage in transparent PETG and it is in use for over three years now. (-> several thousands of movements)