Update: 2024-04-14
New centered version with access to charging jack of the switch.
The down side now is that is consists of two parts. They interlock via a dovetail-connection so they dont come apart when the switch is in there. :-)

Original Post

This design Mounts the Nintendo Switch to the official Pro Controller in a simple, light design. 

My Goal was not to use supports at any costs. This is how the non centered version came to life.
The most recent version has it all: No supports needed and access to the charging jack.

The Fusion 360 files and step are included as well, if you want to tinker with it.

Versions:

1. Basic Version: 
   Mounts Switch in the center, but the charging jack ist covered. (pictures 5, 6 and 7)
2. Non-Centered Version: charging jack is accessible & clip does not cover up venting holes (pictures 8 and 9)
    
3. NEW (April 2024) centered version with access to charging
   consists of two parts as shown in the pictures 1-4.

I reccomend the new centered version.

The Print was done in PETG to give the part a litte bit of flexibility.
If you have any suggestions, like a different angle something, please let me know.