This is a 3D printed air assist nozzle and visible red laser for use with a KC40-III Laser engraver.
This does not require the conversion board to be used.
The red laser module requires 3.3V to 5V DC and comes with ~5cm of wire. You will need to add suitable wiring from the module to the control board.
Tubing will need to be flexible and either ~8mm ID or ~5mm OD. I have used tubing from a small aquarium successfully.