Haworth Fern Seat Forward Tilt Repair Replacement Repair Sitzneigungsverstellung

Hey folks,I own a Haworth Fern and the seat tilt was broken. Specifically, whenever I would lean forward, the seat (the part that you actually sit on, not the backrest) would with an unpleasant noise tilt forward as well - even though it should stay in place. And when I would lean back, it would also snap backward. I took apart the chair and found that there was only a tiny plastic part responsible for this, it was simply worn (see pictures).My wife works for a company that has dozens of Haworth Ferns and it turns out: Most of them have that issue - all because Haworth cheaped out on that particular part. The part in question is rather complex in geometry but it works as follows: When you pull the seat tilt lever on the chair, the part is tilted roughly 90 degrees sideways. Once it is tilted back the big "notch" fixates the seat at either a flat or forward tilt. There are two of these parts, one left, one right, they are identical in geometry. I went to a Haworth retailer to order replacements for these two parts. It turns out (after much back and forth with Haworth) that Haworth does not sell these individually, Haworth only sells entire seat replacements, including the bouden cables, upholstery, etc etc. I live in Germany, they quoted a whopping 330€ (~380USD) for the replacement - just because two tiny plastic notches were worn. The rest of the chair and seat were still 100% functional, looking and feeling almost like new. If it looks like planned obsolescence and if it quacks like planned obsolescence.......So over a few iterations, I recreated the part in FreeCAD (can't recommend that tool, it seems not to like humans). What you need to know: I have zero experience in CAD, I don't even own a 3D printer. I just know someone who does. That's why I used FreeCAD, that's why anybody who knows their way around CAD will probably look at the model and see a much easier way of modelling it. BUT. It works. After a slight bit of sanding, the part fits like a glove and the