120mm fan grill
thingiverse
This product is specifically designed for use with a 120mm fan, and its title clearly states its purpose.
Download Model from thingiverse
With this file you will be able to print 120mm fan grill with your 3D printer. Click on the button and save the file on your computer to work, edit or customize your design. You can also find more 3D designs for printers on 120mm fan grill.