The A1 has 16 magnets that run around the periphery of the bed and 3 rows of 3 that run across the center. These match the indentations my build plate sheet now has on the underside. The ones around the periphery are irrelevant as they’re at the extreme edge, but the 9 through the middle are leaving the elevated bumps on my prints.
All of my plates are worn to shiny metal from the wiping at the back, but that’s not in the print area so doesn’t mess anything up. All of Bambu’s printers do that as part of the nozzle cleaning process.
You can see in the image below where the magnets are on the A1.
After a bit more studying on the Wham Bam plates I decided to go ahead and preorder the upcoming carbon steel plate. Of course, one of the only warnings that comes with it is that if the nozzle touches the plate for leveling at a temperature over 140 it will damage the surface of the plate (140 is the nozzle temperature the A1 levels at).
