The original file "Opel Vauxhall Zafira B Astra H Armlehne / Armrest by jogiarea" looks 100% like my broken off original 2010 Zafira armrest clip. That is very impressive, as it is a quite 3-dimensional design!
Unfortunately, when I printed the part in PLA, I always broke it off when I tried to mount it. Now, that is not surprising, as the original part broke as well...
I made some changes, especially it now is a two-part design, that must be held by a little M3 bolt. This makes it possible to mount it only loosely, set into place, then tighten the bolt.
It has been working fine for me for the last 2 months.
If you need to do further changes to the model, I included my Fusion 360 model (*.f3d) as well.
The author remixed this model.