I've found the emergency plectrum card by PlasticBits yesterday and really liked it.
This is some kind of remix. Just fill the variables and you have a business card with a plectrum.
didn't print it yet but there shouldn't be any problem with it. suppose, that .2 mm layer height is neccessary..
Edit: There was some bug I fixed (missed a library function) but upload went wrong. now it works..