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Improvements:

-clampable clip with different dimensions (depending on the ventilation grille, see pic)
-reinforced backplate
-attachment points changed to be able to grip even large smartphones

The original clip loses tension over time, now it doesn't.
I recommend making the parts with PETG.
With the step data, anyone can customize the parts if necessary.

Print parameters:
4 walls
30% filling
0,2mm layers
 

Also check out my tablet holder for cars!

 Check out my other designs too!