Need a threaded cap for a acrylic globe


I need a threaded cap for this acrylic dome to make it watertight. Any ideas?

One could always 3D print one. Probably the fastest route as these look to be for light fixtures and don’t have caps normally I believe.

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My friend has a 3D printer but I’ve never made anything on it.

If there a simple way to design one with without from scratch designing it?

Or any affordable way to hire someone?

Does that dome have threads or is that just a lip. Usually light domes are not threaded.

It is threaded

6 in. Clear Acrylic Globe - 1/2 in. Threaded Neck - 3.25 in. Neck Opening-American 3202-50630