spiral_outer.py

#!/bin/env python

from pygcode import *
import pygcode
import math

prefix = """
M82 ;absolute extrusion mode
M140 S60     ; set bed temperature to 55 C and continue
M104 S200   ; set hot end temperature to 210 C and continue
M190 S60     ; wait for bed temperature to reach 55 C
M109 S200   ; wait for hot end temperature to reach 210 CG21        ;metric values
G90        ;absolute positioning
M82        ;set extruder to absolute mode
M107       ;start with the fan off
G28 X0 Y0  ;move X/Y to min endstops
G28 Z0     ;move Z to min endstops
G1 Z35.0 F1800 ;move the platform down 15mm
G92 E0                  ;zero the extruded length
G1 F400 X50 E6              ;extrude 6mm of feed stock while moving in x
G92 E0                  ;zero the extruded length again
G1 F1800
G92 E0
G10
M107
G0 F1800 X100 Y100 Z0.2
G11
"""

suffix = """
M104 S0                     ;extruder heater off
M140 S0                     ;heated bed heater off (if you have it)
G91                                    ;relative positioning
G1 E-1 F300                            ;retract the filament a bit before lifting the nozzle, to release some of the pressure
G1 Z+0.5 E-5 X-20 Y-20 F30 ;move Z up a bit and retract filament even more
G28 X0 Y0                              ;move X/Y to min endstops, so the head is out of the way
M84                         ;steppers off
G90                         ;absolute positioning
M82 ;absolute extrusion mode
"""


for cls in pygcode.gcodes._subclasses(pygcode.GCodeMotion):
    cls.param_letters.add('E')


line_width=0.60
first_layer_height=0.2
layer_height=0.06

radius = 25
height = 10

E=0
Z=0
layer=0

print(prefix)
print("G1 F900")

while True:
	local_layer_height = layer_height
	
	# Uncomment to make a cone.
	#radius=radius-layer_height*2

	if radius<line_width or layer*layer_height>height:
		break

	# outline - goes around 2x
	for angle in [x / 200.0 for x in range(0, 400)]:
		local_radius = radius-abs(1-angle) * line_width
		move_distance = 2*math.pi*local_radius/200


		if layer==0:
			local_layer_height = first_layer_height+(angle/2.0)*layer_height
		Z = (layer+angle/2.0)*layer_height+first_layer_height

		E += move_distance*local_layer_height*line_width / (math.pi*(1.75/2)**2)
		
		print("%s" % GCodeLinearMove(X=100+math.sin(angle*2*math.pi)*local_radius,Y=100+math.cos(angle*2*math.pi)*local_radius,Z=Z, E=E))

	# example infill
	for angle in [x / 4.0 for x in range(1, 5)]:
		local_radius = radius-line_width
		move_distance = 2*math.pi*local_radius/4


		E += move_distance*local_layer_height*line_width / (math.pi*(1.75/2)**2)

		print("%s" % GCodeLinearMove(X=100+math.sin(angle*2*math.pi)*local_radius,Y=100+math.cos(angle*2*math.pi)*local_radius,Z=Z, E=E))
	print("M106 S255")		# Fan on
	line_width=0.30
	layer += 1
	print("G1 F1800")

print(suffix)