Valve wants to know what you'd do with its Steam controller if you had a chance to customize it. The gaming behemoth has released the CAD plans for it in an effort to spurn the community to put its own spin on the gamepad be it with accessories or other design ideas. All the external geometry files are available to download from the Steam Community page. "This allows you to create and share to your heart's content," Valve writes. "But you'll need to get in touch with Valve is you want to sell your creations."