Design a printable case for the Freenove FNK0104B

[iamankushpandit]

cases/ holds a printable enclosure per BOARD_NAME, and there is nothing for the Freenove FNK0104B. A case is optional — a board is supported without one — but this board is now on the web installer, so anyone who flashes it has a bare PCB and a loose battery.

What makes this board different from the existing case

Do not adapt the E32R28T-1 shell. Almost every constraint differs:

• The USB-C is on a SHORT edge. On the E32R28T-1 the socket is on a long edge and sits at the bottom in landscape. Here it does not: rotation 0 (portrait) puts it at the bottom, and Braino runs in landscape rotation 3, which puts the cable on the left. A shell that assumes a bottom-exit cable will be wrong by 90°.
• Different board outline and mounting holes. The FNK0104B has its own footprint; measure the real PCB rather than scaling the existing model.
• Speaker. There is a PH1.25 speaker connector and audio now works (FNK0104B: no sound in the app, though the ES8311 codec works #71), so the shell needs a grille or a vent, and somewhere for a small driver to sit without buzzing against a wall.
• Battery. MX1.25 connector. The pack this was developed against is 3000 mAh / 11.1 Wh — physically larger than a small pouch cell, so the compartment needs measuring, not guessing. Strain relief on the MX1.25 lead matters; it is a fragile connector.
• BOOT button. Used by env:s3diag to cycle rotations during bring-up. Worth leaving reachable, even if the shipping firmware does not use it.
• WS2812 LED on GPIO42. Not currently driven by the firmware (FNK0104B: WS2812 status LED unsupported, so there is no feedback channel #72), but a light pipe or a thin window now costs nothing and avoids a second revision later.
• ESP32-S3 with Wi-Fi and BLE. Keep the antenna end of the module clear of any metal, screws or dense infill.

What good looks like

• Prints without supports on a normal FDM printer, like the existing case
• Screen bezel does not intrude on the 240x320 active area
• Capacitive touch works through the bezel edge — note this panel is capacitive, not resistive, so a shell that presses on the glass edge can affect it in ways the resistive board never showed
• Access to USB-C for charging and flashing without disassembly
• The board can be removed without breaking anything

Deliverables

A folder cases/Freenove-FNK0104B/ matching the convention of the existing one — source model plus exported STL, and a short README covering print settings, orientation, and any hardware (screws, inserts) needed.

BOARD_NAME for this board is exactly Freenove-FNK0104B; use that as the folder name so it lines up with the profile.

Notes for anyone picking this up

The board is fully characterised: include/boards/fnk0104b.h has every pin and every measurement, and README.md has a section on it. pio run -e s3diag is a bring-up probe that exercises the display, touch, battery and audio if you need to confirm anything about a physical unit while fitting a shell.

Photographs, measurements, or a first draft are all useful — this does not need to arrive finished.