Print it on its side. The sides are parallel, allowing for a nice surface finish (I recommend enabling ironing).

Printed with 0.8mm nozzle, 0.4mm layer height, 2 wall loops and 10% infill.

Super solid. It‘s PLA but the hot bottle does not get warm enough to soften it.

Print time was about 5 hours on Ender 3 S1 Pro.

This particular chair is a trendoffice to-sync work mesh pro.

It was quite tricky to model in Fusion 360 since the geometry is curved on both the x and y axes.

Enjoy.