This is a convention badge and card holder I designed, inspired by the movie The Fifth Element. It is designed to be worn around the neck and contains an internal cavity to store a wallet-sized card such as a credit card or hotel room key card. The design contains two internal springs to make retaining and ejecting the card easy.
I have included a file of the unit completely assembled for reference, however each of the included parts should be printed separately and carefully glued together to ensure that the card holder mechanism works properly.

I have also included an ID template that you can use to customize and print your own IDs. It can be edited in inkscape or any vector image editor that supports .svg files.

A youtube video showing how the card holder feature works is shown below: