Case for thermal epoxy potting the common Active SAW Filter & LNA module for cooling. I use mine with my flight radar ADS-B setup.

Note: The printing tolerances are very tight (50μm) so that the epoxy does not escape while it is still liquid. You will want to print with a reasonably good quality for it to fit, otherwise you will need to sand it down slightly with a dremel or similar rotary sanding tool.