Speaker grill
thingiverse
I designed this parameterised gril you can use for protecting the back hole in a speaker box. I used 3D tool to check every important parameter. https://www.3d-tool.com/en_free-viewer-download.htm
Download Model from thingiverse
With this file you will be able to print Speaker 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 Speaker grill.