I'm a weird Zune collector and love Gridfinity.  Unfortunately there's not a lot of Zune storage or Zune Gridfinity storage.  So I made some bins.  I tried to maximize the available horizontal space for each model while also still having the bins be stackable.  There's probably some further optimization that can be done, but it works for what I'm after.  The bins are as follows:

• 3x First Gen 30GB (3x2x11)

• 6x Second Gen 80/120GB (3x3x11)

• 9x Second Gen 4/8/16GB Flash (3x3x11)

• 8x Third Gen 16/32/64 HD (3x3x11)

I printed them on a CoreOne+ with .4mm nozzle, .2mm layer height, and 15% infill.  You could probably go down to even 5% infill and .28mm layer height and still be plenty strong enough.