Removed 1.5mm of material from the biggest post, it intervered with my case.
Enlarged the pinhole that connects to the bending arm. The original was a bit too tight (maybe due to my layer thickness).
Added more spacing for the pivot point.
I heat treated (anealed) it in the oven at 90C, now its rock solid.
Installation video (timestamped):
Special thanks to @ThomasLTboom for having this publicly available. Saved me some time modeling! Parkside, get your stuff together, great tools. Though lacks in small places.
The author remixed this model.
Removed 1.5mm of material from the biggest post, it intervered with my case.
Enlarged the pinhole that connects to the bending arm. The original was a bit too tight (maybe due to my layer thickness).
Added more spacing for the pivot point.