If you search on Amazon “B0B8Z1M9TR” you'll find the exact model I have, and this file is supposed to improve. Basically it's a tight fit and prevents movement so to avoid that movement being stress on the one and only USB C connector on the Steam Deck… two files are available: one has that extra bit (like the picture shows) and the other is simpler, more likely sturdy. 

They are probably easy to adapt to different models. Made in Thinkercad.