Do you feel like Valve’s Steam controller is missing that one crucial part? Do you think you can make it?
Valve released CAD files for the Steam controller with some briefly outlines contents. They said “The archive contains several eDrawings viewer files: from Creo Express and native Modelling, to neutral exchange and 3D print files – for compatibility with a wide variety of your design tools.” so, you know, go nuts guys!
While you don’t get to tinker with the mechanical insides, you do get the geometry of all of the external parts. So make those tiny tweaks to Valve’s design or add a goddamn dildo/fleshlight to the controller if you feel like it will help, I almost certain there is a market for that. Which brings me to another point, don’t forget that this is under the Creative Commons license, it means if you want to sell you dildo monstrosity with haptic feedback you need to get Valve’s blessing first. Good luck with that.
You used to be able to get the files from here, but at this moment it doesn’t work, so you might need to wait for a better link from Valve before you start your work