A while back one of the wheels on my older Stokke/Varier Wing office chair broke. It turns out that you can't just buy any standard office wheel and make it fit, the screw holes don't line up and the wheels have a different height. So back then I decided to buy a new set from Stokke/Varier even though the cost with shipping was very high.
After a few years the remaining spares I bought ran out and once again, I would have to buy more. But now that I had a 3D printer I might not have to.
Instead I designed in Fusion 360 a new mount that would fit a much cheaper Clas Ohlson office wheel, using the same screw holes already drilled in the chair.
I was worried that the weight would be too much but it has held up perfectly over the last year having been tested with up to 200 lbs. I'm guessing that it spreads the weight out well enough in combination with using a higher count of perimeters and higher infill (see settings below).
I highly recommend a high number of perimeters, I used 4.