This is my case for the Duet WIFI and Duex board. Included is also a block off plate if you are only running a Duet WIFI without the expansion board.
I call it the Duet Total Access enclosure.
I really wanted an enclosure that had total access for all of my tinkering. I came up with this. It features a 60mm fan blowing through both boards, fast and easy access to both boards, and large feed-through wire stress reliefs. This way you can securely fasten your wires to the main chassis and not have to worry about wires pulling as it opens, and also there's plenty of room for adding future wiring without disturbing your current wiring.
Also, not the latch mechanism isn't pictured but it's kind of slick where it'll allow opening one half at a time to work on only the front board without any flopping around.
Don't judge me on the print quality haha. I decided to tinker with a 1mm nozzle for the first time, not even running a single test print. (I did get all of this printed in about 5 hours however)
This design is currently set up to be used vertically on a 2040, could easily be used on a 2020 rail. If you need it mounted on another side, just mirror your mesh for now. I do plan on adding additional mounting options in the future. I will be redesigning the bottom/mounting half a little bit for more mounting versatility, and additional wire stress relief.
This design uses 4x M5x16-20 to attach the case halves to the chassis, and 4x M4x20 with nuts to attach the boards. The latch attaches with M5x12 screws with lock nuts.
The fan holes are set up for m3 screws.
The STL files are in INCH. You will need to upscale them to Metric in your slicer.
The screw holes are sized for ramming the screws through. There is enough meat on them to tap, but depending on your printers accuracy you may need to touch them up with a drill bit, or counter sink them real quick before self-tapping. Either way, nothing out of the ordinary.