This is ventilation air-intake adjustable grill, with uniform air difuser at ceiling level.

It is built for pipes with exterior dimension of (usually) 125mm and interior of 117mm. Screw is 5cm height.

Part 2 needs to be 3D-printed with some small support. Part 1 can be printed as it is. If print resolution is not very high it migh need some small polish on the screw at the end.