The file 'Biqu B1 Motherboard Fan Silencer 3D Printer Model' is (rar,stl) file type, size is 289.56 KB.
This mod is designed for canceling noise. You need to remove bottom bolt which is under the fan. You can assemble it with stock bolt. Enjoy!
Use 10% infill
0.2 Layer hight0.8 wall thickness