The RGB health LED is driven with PWM for each channel. The health LED also indicates that the blade is powered on when illuminated. Since luminosity is not linear relative to current consumption, 20mA is sufficient in varying lighting conditions and will be provided per channel.
The following video shows printing in progress of the locking mechanism which is responsible for physically uniting all four blades.
PWM Files:
function_stubs.cSPI Files:
function_stubs.c