The Reef Case for CoralBoard SL

The Reef Case is a compact two-piece case for the Synaptics CoralBoard SL. It has a honeycomb vent lid and an optional slip-on TPU bumper, and its bottom plate doubles as a mount, so the board can go from your desk to a drone, robot or tube frame.

Features

• Honeycomb vent lid: gives the board plenty of airflow. The CoralBoard logo and accent outline can be printed in an optional second color.

• Every port stays open: both buttons, USB-A, USB-C, microSD (with a thumb scoop), the Qwiic I2C port, the I2S audio connector and the ribbon-cable slot are all reachable. You never have to open the case to plug something in.

• Reef Guard sleeve (optional): a slim 95A TPU ring with squishy ribbed corners. It slips over the lid and locks in place with a top lip and a bottom lip that tucks under the lid rim, with no tools or glue.

• Mount plate: replaces the plain base and adds two side wings.

  • Zip-tie mounting: four 6.0 × 2.5 mm slots (two per wing) fit 2.5, 3.6 or 4.8 mm ties.

  • Screw mounting: one 15 mm M3 slot per wing gives 12 mm of adjustment.

Print settings

• Lid: PLA or PETG, printed top face down, no supports.

• Mount plate: PLA or PETG, printed flat side down, no supports.

• Reef Guard: 95A TPU, printed top lip down. Use 2 walls and 5% gyroid infill so the corners stay soft and squishy. Supports needed.

• Nozzle and layers: 0.4 mm nozzle, 0.2 mm layer height.

• Color: the logo and outline are optional. Print them in a second color with AMS/MMU, or keep the whole lid one color.

Hardware

• To close the case: 4× M3 × 12 mm button-head screws (ISO 7380). Use button heads, because socket heads stick out below the plate.

• To screw-mount it to a flat plate: 4× M3 × 10 mm button heads, 4× M3 nyloc nuts and washers.

• To mount it on a tube: 2× 4.8 mm zip ties.

Assembly

1. Set the CoralBoard on the mount plate with the holes lined up.

2. Lower the lid over it so the ports line up with the cutouts.

3. Drive the four M3 × 12 mm button-head screws in from the bottom and snug them. Don't overtighten them, or you'll stress the PCB.

4. Optionally, stretch the Reef Guard over the lid until the bottom lip clicks under the rim.

5. Mount it with zip ties or M3 screws through the wing slots.

Notes

• USB-C plugs and standard USB-A plugs fit easily. Very chunky USB-A plugs, may be tight with the sleeve on.

• Zip ties wider than 4.8 mm, such as 7.6 mm ties, won't fit the slots.

Designed by me in Fusion 360 and test-printed on a Creality K2 Plus. Images are renders of my own models plus photos of the printed case.