Bambu Lab A1 with AMS lite Quick Start Manual page 6

Unlock Heatbed
① Flip the base housing 90 degree to the side opposite to the screen.
② Use Allen Key H2 to remove the 4 highlighted screws at the bottom of the Base Housing
to unlock the heatbed
(Be careful when fully releasing the heatbed; use foam padding in the package to
protect the heatbed from swinging).
①
②