Voxelab Aquila DTI holder for bed alignment

make sure your bed is clean before using it!!
print in PLA using support 
you can freehand level your bed or use the g-code  (it will move the hotend to 4 corners)

demo video 
 

Gcode :
G28 ; home
G90 ; use absolute positioning for the XYZ axes
G1 Z30 F3600 ; move the z to clear to prob from the bed
G1 X9 Y58 Z9 F2400 ; point 1
M0 Click to continue
G1 X211 Y58 F2400 ; point 2
M0 Click to continue
G1 X211 Y220 F2400 ; point 3
M0 Click to continue
G1 X9 Y220 F2400 ; point 4