Double Sided ID/Card Holder

TLDR: Double sided open faced card holder for easy access to two cards

MY PROBLEM:
I had an issue that I'm sure many others have probably faced. In order to get into my work office I have to hold two security cards. One allows me into the building, which is shared with other companies, the other lets me into my floor for my company. I was tired of having to keep pulling the right card out of my holder to move around the building so decided to just go ahead and build my own.

Weirdly I couldn't find this style of ID card holder for sale here in Australia, so enjoy my n00b tinkercad model.

NOTES:
- Works with standard sized credit cards / ID cards
- There are two versions, same design but the the card nub is flipped to suit right or left aligned ID text
- Print the model flat and with supports on