Adam Ijaz hates you.
Dbrand made an adapter for the Steam Deck Dock but didn't make it for the--let's face it--far more common JSAUX dock most of us purchased before the official adapter came out.
Thankfully, one of Dbrand's minions took it upon themselves to publish an STL, which I've modified to fit most JSAUX docks. It drops in place, doesn't require you to remove the foam pads, and works with the existing cable.
Successful prints without supports on a MK3S+ with both PLA and PETG at 0.2MM layer height with 0.4MM nozzle.
The author remixed this model.