Switch branches/tags
Find file History
Fetching latest commit…
Cannot retrieve the latest commit at this time.
Failed to load latest commit information.


MxSS - Polycarb 65% Kit for MX/SMK

MxSS - Polycarb 65% Kit for MX/SMK


  • Case: Frosted Polycarbonate, CNC milled
  • Plate: Brass, mirror-finished and electroplated
  • Weight: Same as plate
  • PCB: Custom designed for the MxSS by kawasaki161, White solder mask and ENIG finish


  • 2.9 degrees angle on the case
  • Top mount plate
  • Center USB, Type-B Mini
  • MX and SMK (White and Orange) switch support
  • Holtite support
  • RGB underglow
  • 1.5kg with plate and weight

Keyboard Maintainer: MxBlue

Hardware Supported: Custom PCB, ATMega32u4

Hardware Availability: https://geekhack.org/index.php?topic=94986.0

Make example for this keyboard (after setting up your build environment):

make mxss:default

See build environment setup then the make instructions for more information.

Front LED Operation

The MxSS PCB has 2 front RGB LEDs which has a separate brightness and mode of operation to the rest of the RGB LEDs. These are controlled through the supplied custom keycodes.

There are 3 modes of operation:

  • FLED_OFF - Front LEDs stay off
  • FLED_RGB - Front LEDs are part of the standard RGB LED modes, only works correctly with rainbow modes (will fix on request)
  • FLED_INDI - Top front LED represents Caps Lock status, bottom LED represents current layer

Colors for FLED_INDI mode are hardcoded as hue/saturation values, the caps lock color can be found in mxss_frontled.h, the layer colors are defined in keymap.c (see default/keymap.c for example).

Custom Keycodes

  • FLED_MOD - Cycle between the 3 modes (FLED_OFF -> FLED_RGB -> FLED_INDI)
  • FLED_VAI - Increase front LED brightness
  • FLED_VAD - Decrease front LED brightness

Further Notes

As SAFE_RANGE is used for defining the custom keycodes seen above, please use NEW_SAFE_RANGE as the starting value for any custom keycodes in keymap.c, as per the example.