UPDATE: An updated version of this model can be found here with cooling holes in the lid, HDMI access, microSD access and increased interior height.
This is a reverse engineered version of the very nice ADS-B Project Case by kmetz (https://www.printables.com/model/327396-ads-b-receiver-case-for-raspberry-pi-4b-rtl-sdr-fi) saved in OpenSCAD to allow for easier customization, such as adding access ports, using different SDR/UAT filter sizes, or using various HATs (cooling, UPS, LCD, etc).
If you do not need to customize, kmetz's design is cleaner and a bit nicer, in my opinion.
There is a slight change to the cooling hole design. If you do not change the length or width of the case then the lid from kmetz's original case will work, or you can use the included lid.
The OpenSCAD file requires the BOSL 2.0 (https://github.com/BelfrySCAD/BOSL2) and nutsnbolts (https://github.com/JohK/nutsnbolts) libraries.
The author remixed this model.
This is not so much a re-mix as a reverse engineer as to allow for customization via OpenSCAD. Primary difference if no customization is used is the cooling vent holes on the side of the case.