My design to replace your broken roof vent cover with 60mm diameter pipe. You can re scale to make larger or smaller. Roof Vent Low Line needs the two objects splitting in your slicer. Orientation as is. Print in PETG or ASA. Layer height recommended to be 0.2mm to achieve clean overhangs. The Roof Vent Mesh needs to be printed with upper and lower layers removed in the slicer so that the infill acts as a mesh filter. Use screws in the side holes to secure to your pipe. Don't over tighten the screws and brake your tube.