I missed a critical requirement.  There's a lot of great assistive tech out there that works really well, but boy does it look clinical, boring, medical-- just not exciting.  Whatever I make here must be exciting and engaging.  Part of that is color-- with 3D printing, there's a rainbow of choices.  You can make switches with the colors of your favorite team.  You can pick vibrant colors that grab attention.  You could make a pile of different switches so you can always match the color of your shoes or the ribbons in your hair.  

We need switches with lots of different designs.  Different textures.  Different personality.  

Here's a selection of some of the designs in a variety of colors. All built on the same basic Interact Switch platform.

I've created a bunch of different designs-- and others are free to make plenty more.  The sky is truly the limit.  Additionally, the varied textures are valuable for those with vision impairments-- or even just to provide a tactile association between a switch and its action.  

Simply-- these switches need to be fun.