draw loop

loop-gcode.py

# -*- coding: utf-8 -*-

import math
import cmath

outfile=open("out.gcode","w")

feedrate=0.03  #depends on youre printer
temperature=250
speed=3000
espeed=speed*feedrate
#start point
nowe=0

step=0.6
base=10
r=10
direc=1+0j
now=100+100j -(base/2-r/2)-(base/2+r/2)*1j 
maxLen=190-r

header="""
M107
M104 S"""+str(temperature)+""" ; set temperature
G21; set mm units
G90; set absolute coordinates
G92 E0; reset extruder distance
G28 X0 Y0;home x and y axis
G28 Z0; home Z axis 
G92 E0; reset extrusion distance
M109 S"""+str(temperature)+""" ; wait for temperature to be reached
G21 ; set units to millimeters
G90 ; use absolute coordinates
M82 ; use absolute distances for extrusion
G1 X"""+str(now.real)+""" Y"""+str(now.imag)+""" F12000.000
G1 E0.00000 F"""+str(espeed)+"""
G1 F"""+str(speed)+"""
G2 F"""+str(speed)+"""
G3 F"""+str(speed)+"""
"""


def g1(to,ext=True):
    global now,nowe
    l=abs(now-to)
    if(ext):
        nowe+=feedrate*l
        print("###### LEN ",l)
        print("G1","X"+str(to.real),"Y"+str(to.imag),"E"+str(nowe),file=outfile )
    else:
        print("G1","X"+str(to.real),"Y"+str(to.imag) ,file=outfile)
    
    now=to


def gr(to,center,iscw=False,ext=True):
    global now,nowe,outfile
    code="G2" if iscw else "G3"
    arg=cmath.phase( (to-now)-center)-cmath.phase(-center)
    if(not iscw):arg*=-1
    #if(arg<0):arg += math.pi*2
    l=abs(arg)*abs(center)
    
    if(ext):
        nowe+=feedrate*l
        print("############## trun ",arg*180/math.pi,"degree","len",l)
        print(code,"X"+str(to.real),"Y"+str(to.imag),"I"+str(center.real),"J"+str(center.imag),"E"+str(nowe),file=outfile )
    else:
        print(code,"X"+str(to.real),"Y"+str(to.imag),"I"+str(center.real),"J"+str(center.imag),file=outfile)
    
    now=to

print(header,file=outfile)
d=base

print("G1 E0.1",file=outfile)
nowe=0.1
while(d<maxLen):
    to=now+(d-r)*direc
    g1(to)
    to+=r*direc
    direc*=0+1j #rotation
    to+=r*direc
    gr(to,r*direc)
    d+=step
    
    
print("G1 Z10",file=outfile)
outfile.close()