I printed a few version of the glass, before I got one I was satisfied with. The final version was printed with a 1mm nozzle (I idid not have one, so I drilled a smaller nozzle out), and 0.5 mm layer height.
The glass is printed in yellow transparent PLA, the other part is printed in PETG.
I glued the base and the center piece together. The glass is just pushed over, and sits really tight.