MattHub Case Mount with Lid for Bigscreen Beyond Audio Strap

This is a remake of the MattHub mount for the Bigscreen Beyond audio strap.

The mount backplate is nearly identical to the one bundled with the hub, but my remake features 1.85mm holes instead of 2mm for a stronger fit with undersized 1.9mm M2 screws.

The lid is designed to also work with Matt's mount, so you can save time and only print the lid if you already have that mount.

Lid Features

• LED Holes for the status LEDs (optional)

• Flexible button for reset button access (optional)

• Full coverage of the fore / aft USB ports with a form fitting shroud on most openings

• 2.1mm lid screw holes for easier tightening

• Countersunk screw holes for up to 2mm tall and 3.9mm diameter (nominal) socket head screws for a flush surface

• Only roughly 1.1mm taller than the bare board

• Mostly parameterized with F3D, you can adjust how much space is given to the strap arm, pcb thickness, clearance for components, lid/mount main thickness, screw thread / passthrough diameter, etc

Printing Tips

Print the version matching your hub. Check the back of your hub for the version! For those with the v5.2 "extended cab" prototype, use v5.2 and skip the bottom right screw (it won't align on the prototype).

Orientation and support/support blockers are set up for you in the 3mf, but are included here if you need:

• Type: FDM Recommended, SLA depends on the resin (avoid brittle resins), MJF will likely fuse the button

• Material: PLA, PETG probably fine too

• Nozzle: 0.4

• Layer height: 0.2 (can do 0.1 if you're obsessive about surface finish)

• Orientation: As shown in the 3mf, lid upside down, back plate right side up

• Supports: On lid screw holes, blocked from the button indent - optional but makes the holes a little cleaner for easier assembly. Pop out the supports by pressing a screw or allen key through the holes.

Alternate STLs

• MatthubLidNoButton: Lid without button cutout - still contains LED cutouts

• MatthubLidNoLED: Lid without LED cutouts - still contains button cutout

• MatthubLidNoButtonNoLED: Lid without either button or LED cutouts

Assembly 

Use 4 M2x8 to assemble by placing the backplate behind the audio strap arm and snapping the PCB into place on top of the strap arm. Place the lid over the PCB and tighten the screws.

The mount slides along the audio strap arm just like the original, but if you want it to be fixed in place: add 1 piece of double sided tape on the mount backplate, and 1 piece on the back of the hub PCB.

The tolerances should allow it to be snug with the 2 pieces of double sided tape without introducing a gap. If you get a gap when it's tightened, it's probably from the tape being too thick - this can be accounted for by increasing strap_thickness in increments of 0.1 in the f3d file. If you get a gap when assembled without the audio strap, then increase board_thickness in increments of 0.1 or 0.05 until the gap disappears when fully tightened.