As an aside, the best gadget in this class of thing that I have been looking for was handmade, not 3D printed and not mass produced. It was made by a single enthusiast who poured resin into silicone molds.
They were slow to make (not injection molded) but scalable (i.e. he'd just make more molds) so faster than 3D printing, relatively inexpensive (cheaper than getting a 3D printing company to make) and incredibly good quality.
I'm just not sold on the 3D printing idea still... the guy made this using cardboard, foam, an xacto knife and silicone and it's more effective and flexible than any design I've found on Thingverse.
3D printing is an interesting concept, but I think it's got a loooong way to go before it becomes more than an interesting geek concept for most people.