My version of a bed level test specifically designed to suit a Snapmaker V1's bed.

A couple of recommended settings;

1. 0.4 nozzle
2. 0.3 initial layer height
3. Concentric bottom pattern (Cura)
4. No skirts, brims of rafts

This should give a single layer print with a single line border and 20 lines within the pattern to ascertain if the bed is level and flat.