BTT MMB Enclosure for TradRack
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Electronics Enclosure for the BigTreeTech MMB MCU to mount onto the TradRack MMU.
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With the CAD files released for TradRack I was able to use the original Nebula Electronics Enclosure and modify it to fit the BigTreeTech MMB MCU and still look similar to the original design. The tray still slides out like the original and it secures to the original mounting bracket.
A few key notes:
Button Pins:
I included pins for the two buttons found on the MMB, Reset and Boot. Be aware these will sit nearly flush to the face so you are not likely to click them by mistake. I usually need to use my nail to press them.
Pocket (Enclosure Housing):
In order to allow you to still slide the board tray out with all wires still connected I needed to remove a lot of the material from the side of the pocket. While I don't feel it is overly flimsy it is unfortunately not as sturdy as the Nebula enclosure in this area.
MMB Mounting Screws:
The holes for the two rear screws of the board tray should be tight enough to screw directly in to and secure the board. There was not enough material for a heatset insert like I would have wanted so I left it as a through-hole so you can optionally add a nut to the other side (as I did) to keep it more secure.
Mount Spacer (Front Mounting):
I also added a 2mm spacer for the mounting bracket in order to drop the entire enclosure enough to fit in the front of the unit (as in my pictures) and still clear the selector. This is not a requirement if you intend to mount the enclosure in the same location as original. If using the mount spacer the unit will not longer sit completely flat on a surface, I recommend some kind of stand-offs if you do this. You may also not need the spacer if you aren't using an encoder, I did not test this.
Fanless Variant:
I did not focus on making a version with a fan as the BTT MMB does not have a controllable fan port. If a fan was to be used you'd either need to run another set of wires back to another MCU (and in my eyes, makes CAN pointless) or run it full time off the incoming power which I did not want to do. If there is enough demand I may end up with a version to mount a fan (possibly smaller, in the 3010 sizing) but I would not print and test it myself.