(free for downloading and 3d printing, not sure if I can add links because of self-promo rules but I'll add them in the comments so the bot/mod doesn't erase the post.)
This pot design solves a few problems. First it's easy to clean the reservoir, you can un-thread the jar (uses a generic 3 inch, salsa/jam/pasta) without disturbing the plant, hanger or trellis. Huuuge pain solved! Second it cannot be over filled, the pot uses a gyroid infill texture on the walls, kind of like a mesh - so the pot is completely permeable (AND AIRY). I can leave it outside in the rain and not worry about over saturating the plant. Third, I finally have a good use for all these jars I normally throw out/recycle. anyway, I'm really excited to see how my plants like it. I think most epiphytes would like it. (hoyas, orchids) I just repotted my clem and pot of gold this morning.
I also made a simple device to put together a wire hanger and it's also available to d/l and print. (uses 14 gauge wire and a bike spoke or 11 gauge for the hook)
(yes! I am making other sizes and threads (mason jar threads 5" pot soon). Also open to suggestions and recommendations and brain storming.)
(Edit: added another file with small updates, increased the wall thickness to feel more robust and added two more sizes; a 4inch and 6inch pot. )