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Hi guys, you don't actually need to get a new motherboard to use lightburn on a k40. Check out meerk40t, an awesome free k40 whisperer replacement which is 100 times better. This in itself is a great achievment by the programmer David Olsen, but what makes it amazing is that you can run the software as a kind of Ruida emulator and it will turn your k40 into a ruida machine and then lightburn can connect to it. I have been using it recently with great success. Full disclosure, you do have to update your licence of lightburn for the ruida version which costs 50bucks, if you only have the cheaper grbl version. Once you have set up the k40 in meerk40t and got it working load the console and type 'Ruida control' and it sets it up for you. Then in lightburn you create a manual machine, choose ruida, set the ip address to 127.0.0.1 your local machine then set the dimensions of the bed on your k40 220x320mm. Baddaboom baddabing, test it with your move controls and it should work fine. The github of the project is https://github.com/meerk40t/meerk40t. It is worth a go for free just to see if it can work for you, and you can use the demo version of lightburn which has the ruida controller drivers in it. If you dont like it you can still try tp get hold of the drop in replacement board.