This is a Corne Cherry v4.1 designed by foostan, with all necessary components, including LEDs, mounted on the PCBA. Corrections for polarity and misalignment were made before ordering. Operation has been confirmed. All components are soldered, including sockets, diodes, LEDs, microcontroller (RP2040), USB jack, reset switch, TRS jack, resistors, and capacitors. VIAL firmware has been flashed, and key input and LED lighting have been confirmed. If you want to use it with the official case (for repairs by replacing the PCB, etc.), please cut off the protruding part of the TRS jack. (I can cut it off for you, but please be aware that it may not be a clean cut.) From v4.1, mini-ization is now officially possible. For those who want everything including the case, we recommend purchasing the official kit, which offers higher quality. This is just the PCB, so it's recommended for those who can prepare the other parts themselves, those who have a 3D printer, those who want to mini-ize, or for a second keyboard. You will need: Spacers: 8 M2 screws: 16 For those who purchase the PCB, we can add these as a set for an additional 800 yen. If you don't use rotary encoders, you can use it as is, without soldering. You will also need: ⚪︎ Top plate ⚪︎ Bottom case ⚪︎ Screws ⚪︎ Spacers ⚪︎ MX switches ⚪︎ Keycaps You can use the firmware uploaded on GitHub. (Just drag and drop the uf2 file. It's in the docs.) If you wish, I can also flash the firmware for you, but the firmware is different for the mini (3x5 column) version. Please note that the top plate and case are not compatible with Corne v3 or earlier! corne v4 cherry keyball 39 44 61 DIY keyboard Split keyboard Mechanical keyboard Hot-swap Copyright (c) 2023 foostan Released under the MIT license https://github.com/foostan/crkbd