I got my new Duet in a few days ago. I printed the case designed by kuhnikuehnast. It looked like it would fit perfect on my CR-10 S5. Once I printed all of the parts I realized it didn't really have a good place to attach to the frame of the printer without interference. I am using a Corsair 750w ATX power supply and realized I could almost sit the case ontop of the power supply and the fan in the power supply would blow right through the case, not only that but the stepper drivers on this board dissipate heat through the bottom of the board, so putting a fan blowing directly on them seemed like a great idea. I designed this case to screw onto the power supply with the stock fan screws on the power supply. There isn't room for all of the extra wires as I'm going to just chop off all but a PCI-e power plug. If you want to keep your wires for power supply the wire box can be modified to fit them all.
There are now 2 versions, one of them uses magnets. All magnets are 8mm x 3mm and can be purchased on amazon.