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4 slots which can be individually adjusted (length and width). Drive 1 is on the right and drive 4 is on the left.

Fits this Sabrent hub which was chosen because it is independently powered and has individual power switches. You can adjust the sizing for this as well, though the side cutout will have to be adjusted manually. 

When changing parameters, Fusion 360 throws some errors/warnings about chamfers and fillets but I don't see anything actually wrong with the resulting body. 

The provided STL is sized to fit the older Western Digital Passport drives (the ones with rounded corners, not the two-textured rectangular ones). 

I would suggest slicing a ring to confirm fitment before going and printing the whole thing. 

Note: the pictured print is basically the same as the STL, but has been further customized for my needs.