My Office chair likes to slowly deflate. I created this thing so I could print a few and make my chair stay whatever height I like.
I've uploaded two other versions of this thing that should work better. I found the gap in the first version to cause the rings to crush down into each other. I also uploaded v3 with a wider gap as v2 might be too small and fuse together.
This thing was made with Tinkercad. Edit it online https://tinkercad.com/things/gE8pTrNFW4s
Print as many as you need to keep your office chair at whatever height you like. You can scale it to fit tighter or looser depending on your chair.
I recommend you print them with lots of infill. I printed mine with 3 shells and 25% infill. The 3 shells made it print nearly solid.
I ended up having to use zip ties to hold them in place. If you find that they pop off under pressure you should do the same.