This is to hold and mount your 6 switch rocker plate inside a 30cal ammo box and keeps the parts inside water proof to be on a boat setting. Check your ammo box first to see if it has the same design as what's shown in the photos, but I have tested the 3D printed insert in 2 different brands of ammo cans and they both fit perfectly.
Print in PETG as I bet you will be outdoors in the sun and heat.
No supports are needed and printed on my Elegoo 3 Plus in Overture Black PETG
Link to the websight and where you can buy this 12v rocker switch here.
https://youtu.be/sR6OZXGoVOg
The author marked this model as their own original creation.