Valve is urging 'tinkerers, modders, accessory manufacturers, or folks who just want to 3D print a Steam Deck to see how it feels' to have a go at the portable console's CAD files it uploaded on GitHub. With the surface topography files, fans will be able to 3D-print their own custom Steam Deck shells to compensate for the single black color version at launch.
https://www.notebookcheck.net/Ahead-of-the-Steam-Deck-release-date-Valve-lets-users-3D-print-their-own-custom-shells-for-the-portable-console.599727.0.html
Not sure if that's a great idea - the plastics need to be heat resistant to avoid exhausting toxic fumes during gaming. Potential lawsuit incoming.