I just recently had to relevel my cut bed and going through realigning my laser afterwards, I encountered a seemingly counter intuitive alignment issue.
bottom left in this pic I’m showing that I am aligned at position 3 after going through my normal process of aligning at positions 1 and 2. When I move the laser back to positions 2 and 1 however I find that they are off and drifting down and to the right. I’ve realigned a few more times and this difference was uniform. I also found an odd U shaped drift as I moved the laser toward the back of the machine.
I’ve puzzled through it myself for a while now and I cannot really see anything obvious that might be causing this. My laser is dual headed but I don’t think that really affect it. ( I mostly only use the one side.)
I would be greatful for any advice.