Minimal Mainboard Enclosure

The Minimal Mainboard Enclosure, when you want *just enough* protection for the mainboard from your Framework 13. 

Features Include:

• 2 Framework expansion module mounts.
  • Locking clips included to make sure you don't rip out a port while unplugging stuff…. totally haven't done that before.
• 2 exposed mainboard USBC ports (consider some dust covers).
• A space for your wifi module (so I threw in some expansion slots to use the space).
• Mounting tabs so you can attach it to a (non-flying) plane and defy gravity.
• Some removable RP-SMA mounts for the wifi antennas.
• Modular power button, so you can change out or customize.
• Offset case seams, for mechanical reasons.

Required Hardware:

• 17x _No._ 4x1/2" phillips (+) (~3mm x 12mm) flat head wood screws to attach the upper and lower halves of the case.
• 5x mainboard fasteners to hold your computer in place.
• some glue to stick the base halves together.
• some more _No._ 4 phillips (+) screws to attach the base standoffs to your (non-flying) plane.
• 2x (RP-)SMA wifi antennas with 150mm (6") leads, and antennas

M3x12mm flat socket screws could be used in place of the wood hardware, the top-cover attachment holes are 2mm.

Outer dimensions are approx. 270mm*120mm*14mm, so if you have a large enough print bed, you should be able to print it in 2 parts instead of 4.

Instructions:

1. print case parts:
   • 2x bowties
   • 2x twistlock_pucks
   • 2x twis_tab_half to test printer tolerances if needed.
   • 2x module locking yokes
   • at least 1 power button
   • case parts (left and right)
   • cover parts (left and right)
   • wifi antenna mount. (there are 3 options: V, T, I shape o{0,1,2} )
2. install bowties in the lower halves
3. connect the lower halves
4. install twist locks in the lower part
5. install power button in the right cover
6. attach wifi antenna mount
7. install wifi antennas.
8. install board and wifi module
9. screw the case together
10. install expansion module locking yokes
11. slide in modules
12. power up your board and press the power button.

Design “features” that may need to be corrected:

• The expansion modules sit slightly proud of the lower case, requiring a cutout in the top cover, might get around to adjusting case_lower()::CBWH to be 0.5mm taller.
• The module "lock yokes" aren't sprung, so they may fall out, some thin arms to push them down may be added later (hint hint community).
• the modular mounting / standoff “T” things aren't optimal, something better is needed.
• RP-SMA mounts (wifi antennas) may need to be relocated a bit further from the ram. I am uncertain of the radiation pattern of the stubby 2.4/5GHz antennas I'm using, but may need to be reoriented to reduce potential ram errors (shouldn't be an issue, buuut…). 
• The module lock yokes are an interesting idea, but could be improved, perhaps with a planar flexure assembly, but then you'd need to be able to actuate it from the top and not the bottom like on the laptop.
• The middle seam “twist locks” should only be rotated enough to lock the lower halves together, be careful not to sheer off the nubs. they could be reshaped to be more sturdy (later).
• Strain relief for the power cable. preferable on the “bare” port side of the board so you can use the second module slot for something other than the USBC card for power.

Edit, Dec 22: Update License from CC-A-NC-SA