2.5" to 3.5" Front Mounting Bracket
thingiverse
I needed to mount a Manhattan card reader 100915 (https://manhattanproducts.us/products/manhattan-en-multi-card-readerwriter-100915) in the front of a PC, but of course cases do not have 2.5" bays anymore and this is a 2.5" unit. Most card reader/writer units use these exact dimensions. I did some searching and found a lot of printable internal hard drive adapters, but not one 3.5" external bay style adapter, likely because it's rare you'd need one. To that end I built this 2.5" to 3.5" adapter insert, which is now happily living inside a desktop PC with said Reader/Writer installed. I haven't checked but I suspect with a minor modification you could even mount a 2.5" floppy drive for a retro system build.
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