This is a ceiling fan cap, if have broken one then print this and replace

The shaft suspending the fan from the ceiling is 19mm as per this design, 1 mm clearance has been given

Print it in the same orientation as the stl file.

I printed it with 0.4 mm nozzle at 0.2 mm layer height, you can use a 0.6 mm nozzle at 0.3 mm layer height to save some print time.