Everything you need to make one: the full build on video, the parts, the case files, and the firmware, which installs from your browser. No soldering.
The whole build, start to finish: printing the case, fitting the window and the film, sealing it, and putting it together. Watch it once before you order anything.
The board is most of it — the display and the battery are already on it. The rest is a window, a vent, a sealant and a printed case.
| Part | What it’s for | Approx. |
|---|---|---|
| Waveshare ESP32-S3-RLCD-4.2 | The board: the 4.2″ reflective display and the battery are already on it | $40 |
| Quarter-wave polarizer film | Sits with the window, so the panel reads through polarized sunglasses. Cut to the same 93.2 × 69.7 mm. One sheet does 4–10 | $7 |
| Polycarbonate sheet, 1 mm | The clear front window over the panel. Cut to 93.2 × 69.7 mm | pack |
| Breathable membrane vents | Let the sealed case breathe without letting water in | pack |
| Amazing GOOP Marine | Bonds and seals the window into the case | tube |
| One unit | Buying every part from scratch — filament not included | ~$55 |
| Each, building ten | The film, sheet, vents and sealant go much further than one unit | ~$42 |
| Item | Notes | |
|---|---|---|
| Print files (R25) | Ready-to-print Bambu Studio plates — single or two-color — plus STLs for any other slicer. The README inside has the print settings | free |
| ASA filament | The rigid parts: case, cradle, back cover and sun cover, all on one plate. Holds up to sun and heat in a cockpit. Not PLA — it softens in the sun | spool |
| TPU filament | The flexible parts: button pad, USB plug, display gasket, window gasket and four post caps | spool |
| Bambu Lab P2S | What we print on. ASA prints best in an enclosed printer like this one |
The film, the polycarbonate, the vents and the sealant all come in more than one unit needs, which makes a fleet cheaper per boat than a single build.
Product links are Amazon affiliate links — if you buy through them we earn a small commission at no extra cost to you. Buy anywhere you like; nothing about the build depends on where the parts came from.
Already built one? The Device Guide covers the buttons, the pages and running a start from the display.
The print files are ready to print and free to anyone. The source CAD is a different thing: if you want to change the mount, fit it to a different panel, or design a version for your own boat, you need the model rather than the mesh.
We will hand those over, free, to people doing something real with them — builders, coaches, sailing programs, clubs, anyone teaching this. Send us a note saying who you are and what you have in mind. That is the whole application process; we just like knowing where these end up.