battery lid
thingiverse
I'm looking for a custom lid to fit my marine battery box and I think this one on Thingiverse could be a great solution, it's designed specifically for that type of application, the link is https://www.thingiverse.com/thing:3702164.
Download Model from thingiverse
With this file you will be able to print battery lid 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 battery lid.