Here is my first attempt at the stim for Octane. I printed it using my Prusa MK3S.
To get the color changes I added manual filament changes at certain z heights ("add color Change").

For the "Lining_Gray" it kept slipping on the bed. I decreased the pattern spacing to 1.5, the xy separation to 50%, and added a couple support enforcers. It finally stuck (5th time's a charm!). Print 2 of these! Flat sides down, think St Louis Arch.

For the Green cylinder i printed it at 5% Gyroid infill, with horizontal shell set to 3. This made a neat effect when held up to a light.

I glued the pieces together using super glue (Cyanoacrylate).

Good luck. Please share your makes.