2.5 to Front 3.5 Bay adapter (Design Superseded)
EDIT: This design is now fully superseded by a more durable, printer error resistant version that should be functional even if your printer is out of tune. https://www.thingiverse.com/thing:3582473
This is designed to comfortably retain any size 2.5" "Laptop" HDD from HGST's thin drives up to WD's bulky "Enterprise" Velociraptor drives in a desktop floppy bay that meets the industry SFF-8300 PC parts standards for full system compatibility with a 3.5" "Floppy" front bay. I can release a USB Front Panel design in the future if there is any interest. let me know in the comments! (Double-Drive and Inverted Double-Drive model in development! A weakness that appears in most prints was discovered in the rear section of the drive mount, reinforcement solutions in testing!)
Want to tinker with it for yourself? https://tinkercad.com/things/lLPGYTHyNbN