A small jar, about 3 inches wide, about 2.5 inches tall.

It prints in 3 parts: The base, the lid, and the threads. The separate threading is a press-fit into the lid and has a small notch for clocking.
It will take a little force to get the threads installed into the lid. I tend to put them on a board, line up the lid over top, and press down with my body weight. If you wind up needing to use a hammer, make sure you put a piece of wood on top so you're not beating directly on your print.

I haven't needed to use any glue to hold the threads in, but it probably couldn't hurt anything.