12x12x18 Terrarium Humidity Vent Control

I have some of the inexpensive 12x12x18 pvc/acrylic terrariums to house crested geckos and gargoyle geckos for grow out tanks before they reach full size.  One of the issues that I have with the tanks, are the slots on the sides and back, which let the tank dry out too fast in a day.

Additionally, I intend to use the tanks for mourning geckos once my other geckos get moved to bigger terrariums.  Mourning geckos are notorious for escaping through even the smallest of openings.  With the slots on the sides and back blocked, this will hopefully eliminate some escapees…  Otherwise, I will just glue some screen mesh to the side of the tank…

So I've come up with a solution that essentially hangs off of the top lip and extends down over the slots on the side to prevent moisture loss.  You can set it up to partially or completely block the slots.  The hooks on the top are set up to be tight on the lip of the tank, so I suggest you position the print over how much you want to block the slots and then push it down in place over the top lip.  This is to prevent the piece from inadvertently sliding around and letting your tank dry prematurely again.

This is my first design ever for a 3d printer, so I'm sure there are ways to optimize it for print speed or filament savings, but overall I'm happy with what I came up with and wanted to share it.