NOW SOLD SORRY have for sale in the UK a mint condition Cohesion 3D board to enable your K40 laser to work with lightburn. I will only ship to the UK. They are not hard to fit but require you to follow some basic instructions in wiring. Asking £200 ono.
I have listed the item elsewhere so if your interested get in touch
Drop me a text 07595184153 if you are interested
Some pics here https://photos.app.goo.gl/9dU9h1k3KLAaYAMo9