I calibrated way back when it came out and haven’t done it since. It’s spot on. I agree with @eflyguy on this that the normal course is to run the lid camera calibration the one time and it’s good to go.
Perhaps there is something else throwing off the alignment. Something in the workflow that isn’t right.
If you take out the crumb tray, the laser head should be all the way back out of the way. Open the front garage door and slide the tray out. Shouldn’t interfere with the head.
Bumping the head or gantry can throw things off though, especially when the machine is on. How about your cleaning routine? Are you careful when you clean the lid camera so as not to dislodge it or move it? There have been instances where the lid camera is mechanically set as it should.
I take my tray out all the time and use set focus and it’s just fine with or without.
Tell us a little more about what makes you need to calibrate. Are you saying your lid camera image and design doesn’t match up so that you can cut at the right spot you pick? It is drifting or something?