Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:4151947.
This is a simple bracket for installing a 2.5" hard drive or SSD in to a 3.5" bay. It is a somewhat minimal design. Designed to be relatively cheap without being overly flimsy. With the price of my material, it costs about 50 cents CAD. (Currently roughly 40 cents US)
Note that this is shorter than a normal 3.5" hard drive. There are certain (somewhat rare) situations where you need the entire length, and all three standard holes. If you need a longer bracket, or if you have other requirements that this bracket doesn't meet, check out my other hard drive brackets at the following link: https://www.thingiverse.com/dtylerb/collections/my-hard-drive-brackets
The holes on the side of this bracket should allow you to self tap a #6-32 UNC screw. (The standard ones that are used with 3.5" hard drives, not the M3 screw which has a finer thread and is generally used for optical drives and 2.5" drives - although if you find the hole too small for the 6-32, you could try an M3.)
If you liked this design, consider a tip or post a make!