This is a drawer to go in the 5.25" bay in the front of a PC. There are little nubs on the back side of the drawer that fit in to a slot on the mounting bracket to prevent it from accidentally being pulled out too far or tipped when nothing is mounted above it. It works quite well.
I have included two different mounting brackets which I've called "Double" and "Single". One is a two piece bracket that takes less time and uses less plastic to print, and the other is a single piece bracket. I recommend the double bracket in most cases. I've only included the single piece bracket because I think it will work better in cases that use a screwless quick-connect system, or cases that only allow you to put in screws from one side. If you have a screwless system, you may need to drill out the screw holes a bit larger to accomodate the post or whatever replaces the screws in your setup.
I recommend using #6-32 UNC screws, which are the standard size screw normally used to affix hard drives. NOT the finer thread M3 that are usually used to affix optical drives. I opted for the coarser screws because I thought they'd work better and be harder to strip when using them in relatively thin plastic. You still need to be careful about this.
Note: You can add a bit of lube to the nubs on the back of the drawer and the slots they fit in if it doesn't slide as nicely as you'd like. WD-40 or Superlube both work great.
If you like this design, consider a tip!