People sometimes complain that their mesh bed level keeps shifting. It may be. It also may not be. There are a few things to look at, then depending on the results of the investigation, there are a few things to adjust.

The two most common things that affect this are pretty simple to fix. As it heats up, your 3d printer bed warps and moves pretty significantly. It’s important that you establish your mesh bed level on a bed that has been thoroughly warmed up. Don’t start measuring just as soon as the temperature reads the right temperature. Your temperature sensor is just in one spot. I usually give it 5-10 minutes to “soak,” longer in the winter. The same goes for when you actually print parts. I know it adds time to the print job, but I have had a lot of success with adding a dwell command at the beginning of my prints to allow the bed to come to temperature.

The other issue that I commonly see is how parts are removed. A lot of people put their hand on the print bed while they scrape the part off of the bed. Your bed springs most likely will not return to exactly the same spot as they were before. By pushing down on them, you are most likely causing the bed to return to a slightly different configuration than it was before.