Having searched for a moss pole, I was unable to find anything I liked, so ended up designing my own.

Still a bit of a work in progress. Its modular so you can print multiple sections (The most I have printed and used on a plant is 3 so far). The design is technically scaleable, but be aware that you may need to go a bit finer if you do (otherwise it prints without supports on the standard 0.2mm strength settings). Images show a fullsized version and a version i printed at 50% and also a version with the stabiliser which you can either keep on the surface of your plants soil or bury it fot extra stability.

For the bottom spikes, they are a bit delicate so be aware to screw in via the circular section. all screws can be a little tough as they are quite tight, but you can screw them into place quite nicely as they do ease up with a bit of gentle wiggling. They are an intentionally tight fit.

Material, PLA Basic or PLA+ have both worked well, PETG id imaging would also suit.
Settings: 0.2mm strength defaults, no supports needed. 0.4mm nozzle.

Added a version of the spikes with drainage holes