This is a nice little box for Telesin ND Filters for the Gopro Hero 5 - 7. I printed it on my ender 3 which is very precise, so i designed the gap between the lid and the box to be 0.17mm. If you need a version with more or less gap, i uploaded the original Inventor files too, where the "s1" paramenter in the box file represents the gap. The gap is only applied on the lid, so you can print the box and then try different gaps on the lid (way less to print this way). If you dont have Inventor and need another gap dimension, just leave a comment and i will edit it for you.
I got my ND Filters from AliExpress: https://www.aliexpress.com/item/TELESIN-Optical-Glass-Neutral-Density-ND4-8-16-ND-Fader-Filters-Set-for-Gopro-Hero-5/32900392018.html
I set the wall line count to 4 so the whole thing is just walls to print.