USB, SD card holder

Designed to hold 15 USB thumb drives, 10 Micro SD and 8 SD cards along with a [Transcend](https://www.amazon.com/Transcend-microSDHC-Reader-TS-RDF5K-Black/dp/B009D79VH4/ref=sr_1_3?ie=UTF8&qid=1539202896&sr=8-3&keywords=transend+usb+3.0+card+reader/) card reader. The tray will also hold standard sized SD/Micro SD carry case.

Inspired by the many USB/SD card holder/trays already out in the wild, primarily these:
https://www.thingiverse.com/thing:703138
https://www.thingiverse.com/thing:19113