I have migrated to Printables because of the security and UX issues here at Thingiverse. You can find this model here:

https://www.printables.com/model/166852-drive-bay-adapter

Adapter for fitting a 3.5" device in a 5.25" bay. Useful for mounting your card reader, fan controller, floppy/zip/tape drive, USB header, etc.

Prints without support. All overhangs are 45° except for the screw holes.