Its a LED stripe holder for 1cm wide led-strips.
The cover (part 2) needs only 20min printtime and can be swaped even if the holder is installed. So you only need white leds and can try to change the cover for other colors.
I would use ABS or Vulcano PLA or HIPS.
PLA will be not good because the temprature in the voron 0 can get to 60°C and PLA will deform at this point.
The author hasn't provided the model origin yet.