3D Printing: Python script to generate a bed levelling gcode file for moving the print head sequentially around the build-plate to aid in bed levelling.

bed-levelling.py

# All values are in mm
bed_x_max = 200
bed_y_max = 200
z_hop = 1
inset = 40 # distance in from edges of buildplate to stop at
wait_time = 10 # seconds
repetitions = 5 # Number of times to visit each coordinate
bed_temp = 55 # Bed temperature in Degrees C
file_name = "bed-levelling-{}.gcode".format(inset)

corner_coordinates = [
    [0, 0],
    [bed_x_max, bed_y_max],
    [0, bed_y_max],
    [bed_x_max, 0]
]

with open(file_name, "w") as gcode:
    gcode.write(
"""\
M140 S{bed_temp} ;Start heating the buildplate
G28 ;Home
M190 S{bed_temp} ;Wait for buildplate temp
G90 ;Absolute positioning

; Main loop
""".format(bed_temp=bed_temp)
    )

for index in range(0, repetitions):
    for coord_number, coord in enumerate(corner_coordinates):
        # Inset x coordinates
        if coord[0] < (bed_x_max / 2):
            x_coord = inset
        else:
            x_coord = bed_x_max - inset

        # Inset y coordinates
        if coord[1] < (bed_y_max / 2):
            y_coord = inset
        else:
            y_coord = bed_y_max - inset

        with open(file_name, "a") as gcode:
            gcode.write(
"""\
G1 Z1
G1 X{x} Y{y}
G28 Z0
M117 {i_n}/{it} - {cn}/{ct}
G4 S{t}

""".format(x=x_coord, y=y_coord, t=wait_time, i_n=index + 1, it=repetitions,
           cn=coord_number + 1, ct=corner_coordinates.__len__())
            )

with open(file_name, "a") as gcode:
    gcode.write(
"""\
; End
G1 Z1
G28
"""
    )