KFM is a low cost 4x5 modular mechanical keyboard that everyone can build. Modular it's mean two PCBs can be combined become one 40% keyboard, so you can use the PCB board as single 4x5 macro pad or 4x10 ortholinier mechanical keyboard. The PCB board has some feature like south facing switches orientation, RGB perkey and passive buzzer supported which can be used as layer indicator. The firmware is fully QMK.

This is my second project about mechanical keyboard, now i used as daily driver because this board very flexible and only need small space in my desktop. Visit my Github repository if you interested build one.

Features

• Low cost.
• Modular PCB board.
• Multi layout support.
• Easy to source components.
• Easy to build.
• Arduino Pro Micro 32u4 as MCU.
• RGB perkey support (optional).
• Passive buzzer support.

Default Layout

40% layout

Optional Layout

20% layout

40% layout with 2x 2u keycaps

40% layout with 4x 2u keycaps