No idea what the brand of this chair was, describes itself as a “T2 high back task chair". Had been meaning to try out OpenSCAD and this seemed like a simple first project rather than wait for a replacement part to ship from afar. So 20 minutes later this is what we ended up with. The fit is quite tight, I'm not altogether certain that I'll be able to remove it should the need arise.
The author hasn't provided the model origin yet.