This dock cover is for using the Steam Deck on its OEM Dock. When the Steam Deck has a silicone wrapper or skin on it, there is a likely chance it will not securely seat or even fit into the Dock from Valve.
I made this because I did not want to use a third-party dock for my Steam Deck, as I would lose features like native display-out with multi-monitor support.
This particular cover is made for the Syntech Protective Case for the Steam Deck, but will accommodate skins on the Steam Deck that have a combined thickness of less than 21mm.
The STEP files include a model with crude approximate measurements of the Steam Deck Dock itself, along with the dock cover.
The author marked this model as their own original creation.