It is the tested competitiv version of Modified Nintendo Switch Joy-Con grip (remixed).
No supports.
First uploaded here: https://www.thingiverse.com/thing:2769344
It was tested multiple times in some rounds of Don't drink and drive.
New features:
Warning! The buttons fall out when no controller is installed. They only fall in controller direction not in the other. This is the drawback for the better pressure feeling.
The author remixed this model.