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 chair works like it is supposed to. There is absolutely no need to throw away hundreds of $/€ just because a plastic part is worn. Recommendations: Use a filament that can withstand physical strain, there is a lot of weight (and wear if you frequently change the seat tilt) on the main plastic notch. And there are obviously no proper repair instructions for the Fern but there is a disassembly/recycling instruction on the Haworth website. It helps you take apart and reassemble the chair fairly easily: https://www.haworth.com/content/dam/digital/north-american-assets/haworth-products/seating/fern-family/fern-task/documents/Fern-Disassembly-Recycling-Instructions.pdf Finally, if the part in question is worn, there is a good chance that the corresponding bushing is broken as well. Simply replace with a cut off piece of brass tube (if I remember correctly, 10mm inner diameter, 12mm outer diameter but do measure that just to be sure) and lube it a bit. Have fun with a chair as good as new for almost no money :)