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#!/usr/bin/python
#Interactive RepRap e axis calibration program
#(C) Nathan Zadoks 2011
#Licensed under CC-BY-SA or GPLv2 and higher - Pick your poison.
s=300 #Extrusion speed (mm/min)
n=100 #Default length to extrude
m= 0 #User-entered measured extrusion length
k=300 #Default amount of steps per mm
port='/dev/ttyUSB0' #Default serial port to connect to printer
temp=210 #Default extrusion temperature
tempmax=250 #Maximum extrusion temperature
t=int(n*60)/s #Time to wait for extrusion
try:
from printdummy import printcore
except ImportError:
from printcore import printcore
import time,getopt,sys,os
def float_input(prompt=''):
import sys
f=None
while f==None:
s=raw_input(prompt)
try:
f=float(s)
except ValueError:
sys.stderr.write("Not a valid floating-point number.\n")
sys.stderr.flush()
return f
def wait(t,m=''):
import time,sys
sys.stdout.write(m+'['+(' '*t)+']\r'+m+'[')
sys.stdout.flush()
for i in range(t):
for s in ['|\b','/\b','-\b','\\\b','|']:
sys.stdout.write(s)
sys.stdout.flush()
time.sleep(1.0/5)
print
def w(s):
sys.stdout.write(s)
sys.stdout.flush()
def heatup(p,temp,s=0):
curtemp=gettemp(p)
p.send_now('M109 S%03d'%temp)
p.temp=0
if not s: w("Heating extruder up..")
f=False
while curtemp<=(temp-1):
p.send_now('M105')
time.sleep(0.5)
if not f:
time.sleep(1.5)
f=True
curtemp=gettemp(p)
if curtemp: w(u"\rHeating extruder up.. %3d \xb0C"%curtemp)
if s: print
else: print "\nReady."
def gettemp(p):
try: p.logl
except: setattr(p,'logl',0)
try: p.temp
except: setattr(p,'temp',0)
for n in range(p.logl,len(p.log)):
line=p.log[n]
if 'T:' in line:
try:
setattr(p,'temp',int(line.split('T:')[1].split()[0]))
except: print line
p.logl=len(p.log)
return p.temp
if not os.path.exists(port):
port=0
#Parse options
help=u"""
%s [ -l DISTANCE ] [ -s STEPS ] [ -t TEMP ] [ -p PORT ]
-l --length Length of filament to extrude for each calibration step (default: %d mm)
-s --steps Initial amount of steps to use (default: %d steps)
-t --temp Extrusion temperature in degrees Celsius (default: %d \xb0C, max %d \xb0C)
-p --port Serial port the printer is connected to (default: %s)
-h --help This cruft.
"""[1:-1].encode('utf-8')%(sys.argv[0],n,k,temp,tempmax,port if port else 'auto')
try:
opts,args=getopt.getopt(sys.argv[1:],"hl:s:t:p:",["help","length=","steps=","temp=","port="])
except getopt.GetoptError,err:
print str(err)
print help
sys.exit(2)
for o,a in opts:
if o in ('-h','--help'):
print help
sys.exit()
elif o in ('-l','--length'):
n=float(a)
elif o in ('-s','--steps'):
k=int(a)
elif o in ('-t','--temp'):
temp=int(a)
if temp>=tempmax:
print (u'%d \xb0C? Are you insane?'.encode('utf-8')%temp)+(" That's over nine thousand!" if temp>9000 else '')
sys.exit(255)
elif o in ('-p','--port'):
port=a
#Show initial parameters
print "Initial parameters"
print "Steps per mm: %3d steps"%k
print "Length extruded: %3d mm"%n
print
print "Serial port: %s"%(port if port else 'auto')
p=None
try:
#Connect to printer
w("Connecting to printer..")
try:
p=printcore(port,115200)
except:
print 'Error.'
raise
while not p.online:
time.sleep(1)
w('.')
print " connected."
heatup(p,temp)
#Calibration loop
while n!=m:
heatup(p,temp,True)
p.send_now("G92 E0") #Reset e axis
p.send_now("G1 E%d F%d"%(n,s)) #Extrude length of filament
wait(t,'Extruding.. ')
m=float_input("How many millimeters of filament were extruded? ")
if m==0: continue
if n!=m:
k=(n/m)*k
p.send_now("M92 E%d"%int(round(k))) #Set new step count
print "Steps per mm: %3d steps"%k #Tell user
print 'Calibration completed.' #Yay!
except KeyboardInterrupt:
pass
finally:
if p: p.disconnect()
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