I've printed several Mini Commodore C64 models for coworkers, complete with the 1541 disk drive, but what good is a tiny replica disk drive if you don't have tiny replica disks? I loaded up an image of a 5.25" disk into SketchUp and traced it out. I didn't try to be too exact with dimensions (so don't try to use these as actual 5.25" drives, I guess) but the general shape is right on. I have a single and double-sided version, but am guessing the double sided might be tougher to print. If you're printing them out for the mini C64 1541 drive model listed above, scale it to 20% in your slicer and it should be just about perfect.
I listed the Mini C64 as a source and tagged this as a remix, even though it's not really... but this model won't be terribly relevant outside that.