I created this Stevenson Screen for our outdoor thermometer. There's plenty of similar designs on thingiverse, but I'm also learning how to create such things with Fusion 360, so it was a learning experience as well.

There are two parts to this - the main base, and a lid that sits snugly inside. There's a third .stl which contains a single louver hoop as a test print if you think this design might be useful, but don't want to wait 6+ hours just to see if your thermometer will fit inside.

There's a fair bit of support required - I included a picture at the end of the print how it looked with all the support structure still attached (I sliced via Slic3r Prusa Edition).

Here's the Fusion 360 design.

Print Settings

Printer Brand:

FlashForge

Printer: 

Creator Pro

Rafts:

No

Supports: 

Yes

Resolution:

.2mm

Infill: 

20% Cubic