I successfully installed a camera in my K40 this weekend but I had some problems with the dot pattern camera calibration. I found that the pattern was not being recognized. It was never found in the image. I was using a lightburn camera that I bought so it was not the hardware.
My K40 is customized with a diy z-table with a honeycomb bed. It turned out that the honeycomb dot pattern looked like the printed dot pattern. The holes in the honeycomb were about the same size as the dots. Lightburn was not able to find the dot pattern so all I ever got was a pattern not found error. I resolved this by covering my bed with plain paper so that the honeycomb dots were covered. After this, lightburn was able to see the dot pattern. This should be part of the video or instructions to help others.