I wanted a SDcard holder which also included a slot for a USB reader, so i remixed the model linked below to include a spot. An extra spot for a normal sized SD card was also included.

https://www.printables.com/model/257385-sd-microsd-card-case/comments

To make the USB reader fit, the tray and cover have been increased 0.5mm in thickness, so they are not compatible with the original model.