Slim SD card holder

I wanted a discrete SD card holder that I could secure inside the lid of my Briefcase 3D printer https://www.youtube.com/watch?v=CZ2MgbKJJE8.

I couldn't find an existing design that suited, so here is my answer. I use double sided foam tape to stick it to a surface. The bottom 5mm is solid in case you would rather drill holes and screw it to something. I have allowed a bit of clearance inside. The exact fit is readily fine tuned by applying a bit of heat to the bottom of the curved cutout with a match or cigarette lighter and then pressing it in slightly. It is quite simple to tweak it so that it won't fall out by itself and yet is easily withdrawn with one finger.

I hope you find this useful.