Keychron V3 Max with QMK

What it is

A keyboard with tailor-made firmware. Keychron maintains a QMK fork with wireless support for its keyboards; on that base I built my own keymap for the V3 Max with a knob: one layer for work, one for functions, one for gaming and one for numpad and mouse, each with its own lighting.

Based on QMK Firmware (GPL-2.0) and Keychron’s fork, which provides the wireless support and the V3 Max hardware.

What it does

• Four layers: productivity base, function, gaming and numpad with mouse.
• Two-key combos for undo, redo, cut, copy, paste, save and commenting a line.
• Caps Word with both Shift keys: capitals last only one word or identifier.
• A gaming layer with no Windows key, A/D cleanup so they never clash, and an auto-run on Q+W+E.
• A function layer with media, brightness, switching between three devices over Bluetooth or 2.4 GHz, and a shortcut to flash mode.
• The knob controls volume on every layer, and each layer has its own lighting animation.

What I did

• I built my own four-layer keymap for the V3 Max, written in C on top of Keychron’s base.
• I turned key pairs into shortcuts, to undo, copy, paste or save without taking my hands off the letters.
• I solved movement for gaming: if you press A and D together the last one wins, and a combo keeps W held to run until you decide to stop.
• I made the keyboard explain itself: each layer changes the lighting animation and lights up its own shortcuts.
• I documented every layer with a drawn diagram, so the keymap can be understood without reading a line of C.
• I’ve been refining it since July 2025, combo by combo, as I use it.