Dual Extruders and the TAZ

still do not have the wiring or connectors in, so I have not tried it yet, hopefully next week I can get it running.

I noticed in the config.h file that there are technically 3 temperature sensors defined…even in the standard config for single extruder.

#define TEMP_SENSOR_0 7
#define TEMP_SENSOR_1 7
#define TEMP_SENSOR_2 0

Was there something already plugged in to temp sensor 1’s spot? or is this where you plugged the second extruder thermistor in? It may be nothing though, and might just be ignored if the Config_adv.h is only set to 1 extruder.

for reference, here are the labeled main connectors:


Got the wiring done and everything connected. Loaded the slightly modified firmware (Changed my x, y, and Z limits, enabled EEPROM, adjusted speeds, and of course enabled dual extruders) and it works.
Both hot ends read temp and heat up. Extruders both work (using repetier host).

Still need to find another filament feed tube before I dual print, but I was able to slap the second reel right next to the first, on the same mount.

Its hard to see in the picture, but there is height adjustment for the second extruder built in, so it was fairly easy to get both tips leveled.

did you get your issues figured out?

Just noticed that lulzbot does not sell the filament feed tube…
Any suggestions on where to get it? or what type of tube it is?

I tried some plastic airline material we have in house, but too much friction.

Cool! :slight_smile:

Yeah mine is still out.

I have re-uploaded the taz firmware from here

I still read T120 even when none of the thermistors are plugged in.
I think I am kind of stuck.

See required hardware here: http://www.thingiverse.com/thing:22759

It’s PTFE. Pretty sure you can find the supplier in the AO-101 or TAZ BOM.

I bought an HDPE tube at the local hardware store…it seems to be doing the job.

But noticed some wierd things with Slicer…it seems to make a HUGE offset for the skirt when you have the skirt on. So huge that it is outside the print area. And yes, the offset setting is set to 6mm. Seems like a bug in the program.

with skirt disabled it seems OK, and I am printing my first support material test part now.

EDIT…it might be an issue with the STL causing the skirt to mess up. It tried to print in a few strange spots…but the print did finish and supported everything.

here is my configuration.h file

The main difference is:
#define X_MAX_POS 285 (decreased)
#define Y_MAX_POS 325 (increased)
#define Z_MAX_POS 222 (decreased, or it hits the taz sign)
#define DEFAULT_MAX_FEEDRATE {192, 208, 4, 45} (slowed them all down so it would not miss steps)
#define EEPROM_SETTINGS (enabled this)
#define EEPROM_CHITCHAT (and enabled this)


// This configurtion file contains the basic settings.
// Advanced settings can be found in Configuration_adv.h 
// BASIC SETTINGS: select your board type, temperature sensor type, axis scaling, and endstop configuration

//User specified version info of this build to display in [Pronterface, etc] terminal window during startup.
//Implementation of an idea by Prof Braino to inform user that any changes made
//to this build by the user have been successfully uploaded into firmware.
#define STRING_VERSION_CONFIG_H "2013-06-13" // build date and time
#define STRING_CONFIG_H_AUTHOR "1013" //Who made the changes.

// SERIAL_PORT selects which serial port should be used for communication with the host.
// This allows the connection of wireless adapters (for instance) to non-default port pins.
// Serial port 0 is still used by the Arduino bootloader regardless of this setting.
#define SERIAL_PORT 0

// This determines the communication speed of the printer
//#define BAUDRATE 250000
#define BAUDRATE 115200

//// The following define selects which electronics board you have. Please choose the one that matches your setup
// 10 = Gen7 custom (Alfons3 Version) "https://github.com/Alfons3/Generation_7_Electronics"
// 11 = Gen7 v1.1, v1.2 = 11
// 12 = Gen7 v1.3
// 13 = Gen7 v1.4
// 3  = MEGA/RAMPS up to 1.2 = 3
// 33 = RAMPS 1.3 (Power outputs: Extruder, Bed, Fan)
// 34 = RAMPS 1.3 (Power outputs: Extruder0, Extruder1, Bed)
// 4  = Duemilanove w/ ATMega328P pin assignment
// 5  = Gen6
// 51 = Gen6 deluxe
// 6  = Sanguinololu < 1.2
// 62 = Sanguinololu 1.2 and above
// 63 = Melzi
// 7  = Ultimaker
// 71 = Ultimaker (Older electronics. Pre 1.5.4. This is rare)
// 8  = Teensylu
// 81 = Printrboard (AT90USB1286)
// 82 = Brainwave (AT90USB646)
// 9  = Gen3+
// 70 = Megatronics
// 90 = Alpha OMCA board
// 91 = Final OMCA board
// 301 = Rambo

#define MOTHERBOARD 301

//// The following define selects which power supply you have. Please choose the one that matches your setup
// 1 = ATX
// 2 = X-Box 360 203Watts (the blue wire connected to PS_ON and the red wire to VCC)

#define POWER_SUPPLY 1

//=============================Thermal Settings  ============================
//--NORMAL IS 4.7kohm PULLUP!-- 1kohm pullup can be used on hotend sensor, using correct resistor and table
//// Temperature sensor settings:
// -2 is thermocouple with MAX6675 (only for sensor 0)
// -1 is thermocouple with AD595
// 0 is not used
// 1 is 100k thermistor - best choice for EPCOS 100k (4.7k pullup)
// 2 is 200k thermistor - ATC Semitec 204GT-2 (4.7k pullup)
// 3 is mendel-parts thermistor (4.7k pullup)
// 4 is 10k thermistor !! do not use it for a hotend. It gives bad resolution at high temp. !!
// 5 is 100K thermistor - ATC Semitec 104GT-2 (Used in ParCan) (4.7k pullup)
// 6 is 100k EPCOS - Not as accurate as table 1 (created using a fluke thermocouple) (4.7k pullup)
// 7 is 100k Honeywell thermistor 135-104LAG-J01 (4.7k pullup)
// 8 is 100k 0603 SMD Vishay NTCS0603E3104FXT (4.7k pullup)
// 9 is 100k GE Sensing AL03006-58.2K-97-G1 (4.7k pullup)
// 10 is 100k RS thermistor 198-961 (4.7k pullup)
//    1k ohm pullup tables - This is not normal, you would have to have changed out your 4.7k for 1k 
//                          (but gives greater accuracy and more stable PID)
// 51 is 100k thermistor - EPCOS (1k pullup)
// 52 is 200k thermistor - ATC Semitec 204GT-2 (1k pullup)
// 55 is 100k thermistor - ATC Semitec 104GT-2 (Used in ParCan) (1k pullup)

#define TEMP_SENSOR_0 7
#define TEMP_SENSOR_1 7
#define TEMP_SENSOR_2 0

// Actual temperature must be close to target for this long before M109 returns success
#define TEMP_RESIDENCY_TIME 10	// (seconds)
#define TEMP_HYSTERESIS 3       // (degC) range of +/- temperatures considered "close" to the target one
#define TEMP_WINDOW     1       // (degC) Window around target to start the recidency timer x degC early.

// The minimal temperature defines the temperature below which the heater will not be enabled It is used
// to check that the wiring to the thermistor is not broken. 
// Otherwise this would lead to the heater being powered on all the time.
#define HEATER_0_MINTEMP 5
#define HEATER_1_MINTEMP 5
#define HEATER_2_MINTEMP 5
#define BED_MINTEMP 5

// When temperature exceeds max temp, your heater will be switched off.
// This feature exists to protect your hotend from overheating accidentally, but *NOT* from thermistor short/failure!
// You should use MINTEMP for thermistor short/failure protection.
#define HEATER_0_MAXTEMP 250
#define HEATER_1_MAXTEMP 250
#define HEATER_2_MAXTEMP 250
#define BED_MAXTEMP 150

// If your bed has low resistance e.g. .6 ohm and throws the fuse you can duty cycle it to reduce the
// average current. The value should be an integer and the heat bed will be turned on for 1 interval of

// PID settings:
// Comment the following line to disable PID and enable bang-bang.
#define PIDTEMP
#define PID_MAX 256 // limits current to nozzle; 256=full current
#ifdef PIDTEMP
  //#define PID_DEBUG // Sends debug data to the serial port. 
  //#define PID_OPENLOOP 1 // Puts PID in open loop. M104/M140 sets the output power from 0 to PID_MAX
  #define PID_FUNCTIONAL_RANGE 10 // If the temperature difference between the target temperature and the actual temperature
                                  // is more then PID_FUNCTIONAL_RANGE then the PID will be shut off and the heater will be set to min/max.
  #define PID_INTEGRAL_DRIVE_MAX 255  //limit for the integral term
  #define K1 0.95 //smoothing factor withing the PID
  #define PID_dT ((16.0 * 8.0)/(F_CPU / 64.0 / 256.0)) //sampling period of the temperature routine

// If you are using a preconfigured hotend then you can use one of the value sets by uncommenting it
// Ultimaker
    #define  DEFAULT_Kp 22.2
    #define  DEFAULT_Ki 1.08  
    #define  DEFAULT_Kd 114  

// Makergear
//    #define  DEFAULT_Kp 7.0
//    #define  DEFAULT_Ki 0.1  
//    #define  DEFAULT_Kd 12  

// Mendel Parts V9 on 12V    
//    #define  DEFAULT_Kp 63.0
//    #define  DEFAULT_Ki 2.25
//    #define  DEFAULT_Kd 440
#endif // PIDTEMP

// Bed Temperature Control
// Select PID or bang-bang with PIDTEMPBED.  If bang-bang, BED_LIMIT_SWITCHING will enable hysteresis
// uncomment this to enable PID on the bed.   It uses the same ferquency PWM as the extruder. 
// If your PID_dT above is the default, and correct for your hardware/configuration, that means 7.689Hz,
// which is fine for driving a square wave into a resistive load and does not significantly impact you FET heating.
// This also works fine on a Fotek SSR-10DA Solid State Relay into a 250W heater. 
// If your configuration is significantly different than this and you don't understand the issues involved, you proabaly 
// shouldn't use bed PID until someone else verifies your hardware works.
// If this is enabled, find your own PID constants below.
//#define PIDTEMPBED

// This sets the max power delived to the bed, and replaces the HEATER_BED_DUTY_CYCLE_DIVIDER option.
// all forms of bed control obey this (PID, bang-bang, bang-bang with hysteresis)
// setting this to anything other than 256 enables a form of PWM to the bed just like HEATER_BED_DUTY_CYCLE_DIVIDER did,
// so you shouldn't use it unless you are OK with PWM on your bed.  (see the comment on enabling PIDTEMPBED)
#define MAX_BED_POWER 256 // limits duty cycle to bed; 256=full current

//120v 250W silicone heater into 4mm borosilicate (MendelMax 1.5+)
//from FOPDT model - kp=.39 Tp=405 Tdead=66, Tc set to 79.2, argressive factor of .15 (vs .1, 1, 10)
    #define  DEFAULT_bedKp 10.00
    #define  DEFAULT_bedKi .023
    #define  DEFAULT_bedKd 305.4

//120v 250W silicone heater into 4mm borosilicate (MendelMax 1.5+)
//from pidautotune
//    #define  DEFAULT_bedKp 97.1
//    #define  DEFAULT_bedKi 1.41
//    #define  DEFAULT_bedKd 1675.16

// FIND YOUR OWN: "M303 E-1 C8 S90" to run autotune on the bed at 90 degreesC for 8 cycles.
#endif // PIDTEMPBED

//this prevents dangerous Extruder moves, i.e. if the temperature is under the limit
//can be software-disabled for whatever purposes by
//if PREVENT_DANGEROUS_EXTRUDE is on, you can still disable (uncomment) very long bits of extrusion separately.

#define EXTRUDE_MAXLENGTH (X_MAX_LENGTH+Y_MAX_LENGTH) //prevent extrusion of very large distances.

//=============================Mechanical Settings===========================

// Uncomment the following line to enable CoreXY kinematics
// #define COREXY

// corse Endstop Settings
#define ENDSTOPPULLUPS // Comment this out (using // at the start of the line) to disable the endstop pullup resistors

  // fine Enstop settings: Individual Pullups. will be ignord if ENDSTOPPULLUPS is defined


// The pullups are needed if you directly connect a mechanical endswitch between the signal and ground pins.
const bool X_ENDSTOPS_INVERTING = true; // set to true to invert the logic of the endstops. 
const bool Y_ENDSTOPS_INVERTING = true; // set to true to invert the logic of the endstops. 
const bool Z_ENDSTOPS_INVERTING = true; // set to true to invert the logic of the endstops. 

// For Inverting Stepper Enable Pins (Active Low) use 0, Non Inverting (Active High) use 1
#define X_ENABLE_ON 0
#define Y_ENABLE_ON 0
#define Z_ENABLE_ON 0
#define E_ENABLE_ON 0 // For all extruders

// Disables axis when it's not being used.
#define DISABLE_X false
#define DISABLE_Y false
#define DISABLE_Z false
#define DISABLE_E false // For all extruders

#define INVERT_X_DIR false    // for Mendel set to false, for Orca set to true
#define INVERT_Y_DIR true    // for Mendel set to true, for Orca set to false
#define INVERT_Z_DIR false     // for Mendel set to false, for Orca set to true
#define INVERT_E0_DIR true   // for direct drive extruder v9 set to true, for geared extruder set to false
#define INVERT_E1_DIR true    // for direct drive extruder v9 set to true, for geared extruder set to false
#define INVERT_E2_DIR true   // for direct drive extruder v9 set to true, for geared extruder set to false

// Sets direction of endstops when homing; 1=MAX, -1=MIN
#define X_HOME_DIR -1
#define Y_HOME_DIR -1
#define Z_HOME_DIR -1

#define min_software_endstops true //If true, axis won't move to coordinates less than HOME_POS.
#define max_software_endstops true  //If true, axis won't move to coordinates greater than the defined lengths below.
// Travel limits after homing
#define X_MAX_POS 285
#define X_MIN_POS 0
#define Y_MAX_POS 325
#define Y_MIN_POS 0
#define Z_MAX_POS 222
#define Z_MIN_POS 0


// The position of the homing switches
//#define MANUAL_HOME_POSITIONS  // If defined, MANUAL_*_HOME_POS below will be used
//#define BED_CENTER_AT_0_0  // If defined, the center of the bed is at (X=0, Y=0)

//Manual homing switch locations:

#define NUM_AXIS 4 // The axis order in all axis related arrays is X, Y, Z, E
#define HOMING_FEEDRATE {50*60, 50*60, 4*60, 0}  // set the homing speeds (mm/min)

// default settings 

#define DEFAULT_AXIS_STEPS_PER_UNIT   {100.5,100.5,800,800,800}  // default steps per unit for ultimaker 
#define DEFAULT_MAX_FEEDRATE          {192, 208, 4, 45}    // (mm/sec)    
#define DEFAULT_MAX_ACCELERATION      {9000,9000,100,10000}    // X, Y, Z, E maximum start speed for accelerated moves. E default values are good for skeinforge 40+, for older versions raise them a lot.

#define DEFAULT_ACCELERATION          500    // X, Y, Z and E max acceleration in mm/s^2 for printing moves 
#define DEFAULT_RETRACT_ACCELERATION  3000   // X, Y, Z and E max acceleration in mm/s^2 for r retracts

// Offset of the extruders (uncomment if using more than one and relying on firmware to position when changing).
// The offset has to be X=0, Y=0 for the extruder 0 hotend (default extruder).
// For the other hotends it is their distance from the extruder 0 hotend.
// #define EXTRUDER_OFFSET_X {0.0, 20.00} // (in mm) for each extruder, offset of the hotend on the X axis
// #define EXTRUDER_OFFSET_Y {0.0, 5.00}  // (in mm) for each extruder, offset of the hotend on the Y axis

// The speed change that does not require acceleration (i.e. the software might assume it can be done instanteneously)
#define DEFAULT_XYJERK                5.0    // (mm/sec)
#define DEFAULT_ZJERK                 0.4     // (mm/sec)
#define DEFAULT_EJERK                 5.0    // (mm/sec)

//=============================Additional Features===========================

// the microcontroller can store settings in the EEPROM, e.g. max velocity...
// M500 - stores paramters in EEPROM
// M501 - reads parameters from EEPROM (if you need reset them after you changed them temporarily).  
// M502 - reverts to the default "factory settings".  You still need to store them in EEPROM afterwards if you want to.
//define this to enable eeprom support
//to disable EEPROM Serial responses and decrease program space by ~1700 byte: comment this out:
// please keep turned on if you can.

//LCD and SD support
//#define ULTRA_LCD  //general lcd support, also 16x2
//#define SDSUPPORT // Enable SD Card Support in Hardware Console

//#define ULTIMAKERCONTROLLER //as available from the ultimaker online store.
//#define ULTIPANEL  //the ultipanel as on thingiverse

// The RepRapDiscount Smart Controller (white PCB)
// http://reprap.org/wiki/RepRapDiscount_Smart_Controller

// The GADGETS3D G3D LCD/SD Controller (blue PCB)
// http://reprap.org/wiki/RAMPS_1.3/1.4_GADGETS3D_Shield_with_Panel
//#define G3D_PANEL

//automatic expansion
 #define ULTIPANEL
 #define NEWPANEL

// Preheat Constants
#define PLA_PREHEAT_FAN_SPEED 255		// Insert Value between 0 and 255

#define ABS_PREHEAT_FAN_SPEED 255		// Insert Value between 0 and 255

//  #define NEWPANEL  //enable this if you have a click-encoder panel
  #define SDSUPPORT
  #define ULTRA_LCD
  #define LCD_WIDTH 20
  #define LCD_HEIGHT 4
#else //no panel but just lcd 
  #ifdef ULTRA_LCD
    #define LCD_WIDTH 16
    #define LCD_HEIGHT 2    

// Increase the FAN pwm frequency. Removes the PWM noise but increases heating in the FET/Arduino
//#define FAST_PWM_FAN

// M240  Triggers a camera by emulating a Canon RC-1 Remote
// Data from: http://www.doc-diy.net/photo/rc-1_hacked/
// #define PHOTOGRAPH_PIN     23

// SF send wrong arc g-codes when using Arc Point as fillet procedure
//#define SF_ARC_FIX

#include "Configuration_adv.h"
#include "thermistortables.h"


and my configuration_adv.h file (which should be the same as the lulzbot one)
I did not define the extruder offset in the firmware…but I might, since slic3r is doing some strange stuff, and I think it is due to the offset.


//=============================Thermal Settings  ============================

  #define BED_HYSTERESIS 2 //only disable heating if T>target+BED_HYSTERESIS and enable heating if T>target-BED_HYSTERESIS
#define BED_CHECK_INTERVAL 5000 //ms between checks in bang-bang control

//// Heating sanity check:
// This waits for the watchperiod in milliseconds whenever an M104 or M109 increases the target temperature
// If the temperature has not increased at the end of that period, the target temperature is set to zero. 
// It can be reset with another M104/M109. This check is also only triggered if the target temperature and the current temperature
//  differ by at least 2x WATCH_TEMP_INCREASE
//#define WATCH_TEMP_PERIOD 40000 //40 seconds
//#define WATCH_TEMP_INCREASE 10  //Heat up at least 10 degree in 20 seconds

// Wait for Cooldown
// This defines if the M109 call should not block if it is cooling down.
// example: From a current temp of 220, you set M109 S200. 
// if CooldownNoWait is defined M109 will not wait for the cooldown to finish
#define CooldownNoWait true

#ifdef PIDTEMP
  // this adds an experimental additional term to the heatingpower, proportional to the extrusion speed.
  // if Kc is choosen well, the additional required power due to increased melting should be compensated.
    #define  DEFAULT_Kc (1) //heatingpower=Kc*(e_speed)

//automatic temperature: The hot end target temperature is calculated by all the buffered lines of gcode.
//The maximum buffered steps/sec of the extruder motor are called "se".
//You enter the autotemp mode by a M109 S<mintemp> T<maxtemp> F<factor>
// the target temperature is set to mintemp+factor*se[steps/sec] and limited by mintemp and maxtemp
// you exit the value by any M109 without F*
// Also, if the temperature is set to a value <mintemp, it is not changed by autotemp.
// on an ultimaker, some initial testing worked with M109 S215 B260 F1 in the start.gcode
#define AUTOTEMP

//  extruder run-out prevention. 
//if the machine is idle, and the temperature over MINTEMP, every couple of SECONDS some filament is extruded
#define EXTRUDER_RUNOUT_ESTEPS 14. //mm filament
#define EXTRUDER_RUNOUT_SPEED 1500.  //extrusion speed

//These defines help to calibrate the AD595 sensor in case you get wrong temperature measurements.
//The measured temperature is defined as "actualTemp = (measuredTemp * TEMP_SENSOR_AD595_GAIN) + TEMP_SENSOR_AD595_OFFSET"
#define TEMP_SENSOR_AD595_OFFSET 0.0
#define TEMP_SENSOR_AD595_GAIN   1.0

//This is for controlling a fan to cool down the stepper drivers
//it will turn on when any driver is enabled
//and turn off after the set amount of seconds from last driver being disabled again
//#define CONTROLLERFAN_PIN 23 //Pin used for the fan to cool controller, comment out to disable this function
#define CONTROLLERFAN_SEC 60 //How many seconds, after all motors were disabled, the fan should run

// When first starting the main fan, run it at full speed for the
// given number of milliseconds.  This gets the fan spinning reliably
// before setting a PWM value. (Does not work with software PWM for fan on Sanguinololu)
//#define FAN_KICKSTART_TIME 100

//=============================Mechanical Settings===========================

// This defines the number of extruders
#define EXTRUDERS 2

#define ENDSTOPS_ONLY_FOR_HOMING // If defined the endstops will only be used for homing

//// Added by ZetaPhoenix 09-15-2012
#ifdef MANUAL_HOME_POSITIONS  // Use manual limit switch locations
#else //Set min/max homing switch positions based upon homing direction and min/max travel limits
  //X axis
  #if X_HOME_DIR == -1
    #ifdef BED_CENTER_AT_0_0
      #define X_HOME_POS X_MAX_LENGTH * -0.5
      #define X_HOME_POS X_MIN_POS
    #endif //BED_CENTER_AT_0_0
    #ifdef BED_CENTER_AT_0_0
      #define X_HOME_POS X_MAX_LENGTH * 0.5
      #define X_HOME_POS X_MAX_POS
    #endif //BED_CENTER_AT_0_0
  #endif //X_HOME_DIR == -1
  //Y axis
  #if Y_HOME_DIR == -1
    #ifdef BED_CENTER_AT_0_0
      #define Y_HOME_POS Y_MAX_LENGTH * -0.5
      #define Y_HOME_POS Y_MIN_POS
    #endif //BED_CENTER_AT_0_0
    #ifdef BED_CENTER_AT_0_0
      #define Y_HOME_POS Y_MAX_LENGTH * 0.5
      #define Y_HOME_POS Y_MAX_POS
    #endif //BED_CENTER_AT_0_0
  #endif //Y_HOME_DIR == -1
  // Z axis
  #if Z_HOME_DIR == -1 //BED_CENTER_AT_0_0 not used
    #define Z_HOME_POS Z_MIN_POS
    #define Z_HOME_POS Z_MAX_POS
  #endif //Z_HOME_DIR == -1
#endif //End auto min/max positions

//#define Z_LATE_ENABLE // Enable Z the last moment. Needed if your Z driver overheats.

// A single Z stepper driver is usually used to drive 2 stepper motors.
// Uncomment this define to utilize a separate stepper driver for each Z axis motor.
// Only a few motherboards support this, like RAMPS, which have dual extruder support (the 2nd, often unused, extruder driver is used
// to control the 2nd Z axis stepper motor). The pins are currently only defined for a RAMPS motherboards.
// On a RAMPS (or other 5 driver) motherboard, using this feature will limit you to using 1 extruder.

  #undef EXTRUDERS
  #define EXTRUDERS 1

//homing hits the endstop, then retracts by this distance, before it tries to slowly bump again:
#define X_HOME_RETRACT_MM 5 
#define Y_HOME_RETRACT_MM 5 
#define Z_HOME_RETRACT_MM 1 
//#define QUICK_HOME  //if this is defined, if both x and y are to be homed, a diagonal move will be performed initially.

#define AXIS_RELATIVE_MODES {false, false, false, false}

#define MAX_STEP_FREQUENCY 40000 // Max step frequency for Ultimaker (5000 pps / half step)

//By default pololu step drivers require an active high signal. However, some high power drivers require an active low signal as step.
#define INVERT_X_STEP_PIN false
#define INVERT_Y_STEP_PIN false
#define INVERT_Z_STEP_PIN false
#define INVERT_E_STEP_PIN false

//default stepper release if idle

#define DEFAULT_MINIMUMFEEDRATE       0.0     // minimum feedrate

// minimum time in microseconds that a movement needs to take if the buffer is emptied.
#define DEFAULT_MINSEGMENTTIME        20000

// If defined the movements slow down when the look ahead buffer is only half full
#define SLOWDOWN

// Frequency limit
// See nophead's blog for more info
// Not working O
//#define XY_FREQUENCY_LIMIT  15

// Minimum planner junction speed. Sets the default minimum speed the planner plans for at the end
// of the buffer and all stops. This should not be much greater than zero and should only be changed
// if unwanted behavior is observed on a user's machine when running at very slow speeds.
#define MINIMUM_PLANNER_SPEED 0.05// (mm/sec)

// MS1 MS2 Stepper Driver Microstepping mode table

// Microstep setting (Only functional when stepper driver microstep pins are connected to MCU.
#define MICROSTEP_MODES {16,16,4,16,16} // [1,2,4,8,16]

// Motor Current setting (Only functional when motor driver current ref pins are connected to a digital trimpot on supported boards)
#define DIGIPOT_MOTOR_CURRENT {165,165,220,135,135} // Values 0-255 (RAMBO 135 = ~0.75A, 185 = ~1A)

//=============================Additional Features===========================

#define SD_FINISHED_STEPPERRELEASE true  //if sd support and the file is finished: disable steppers?
#define SD_FINISHED_RELEASECOMMAND "M84 X Y Z E" // You might want to keep the z enabled so your bed stays in place.

// The hardware watchdog should reset the Microcontroller disabling all outputs, in case the firmware gets stuck and doesn't do temperature regulation.
//#define USE_WATCHDOG

// If you have a watchdog reboot in an ArduinoMega2560 then the device will hang forever, as a watchdog reset will leave the watchdog on.
// The "WATCHDOG_RESET_MANUAL" goes around this by not using the hardware reset.
//  However, THIS FEATURE IS UNSAFE!, as it will only work if interrupts are disabled. And the code could hang in an interrupt routine with interrupts disabled.

// Enable the option to stop SD printing when hitting and endstops, needs to be enabled from the LCD menu when this option is enabled.

// extruder advance constant (s2/mm3)
// advance (steps) = STEPS_PER_CUBIC_MM_E * EXTUDER_ADVANCE_K * cubic mm per second ^ 2
// hooke's law says:		force = k * distance
// bernoulli's priniciple says:	v ^ 2 / 2 + g . h + pressure / density = constant
// so: v ^ 2 is proportional to number of steps we advance the extruder
//#define ADVANCE

#ifdef ADVANCE

  #define D_FILAMENT 2.85
  #define STEPS_MM_E 836
  #define EXTRUTION_AREA (0.25 * D_FILAMENT * D_FILAMENT * 3.14159)
  #define STEPS_PER_CUBIC_MM_E (axis_steps_per_unit[E_AXIS]/ EXTRUTION_AREA)

#endif // ADVANCE

// Arc interpretation settings:

const unsigned int dropsegments=5; //everything with less than this number of steps will be ignored as move and joined with the next movement

// If you are using a RAMPS board or cheap E-bay purchased boards that do not detect when an SD card is inserted
// You can get round this by connecting a push button or single throw switch to the pin defined as SDCARDCARDDETECT 
// in the pins.h file.  When using a push button pulling the pin to ground this will need inverted.  This setting should
// be commented out otherwise


// Power Signal Control Definitions
// By default use ATX definition
  #define POWER_SUPPLY 1
// 1 = ATX
#if (POWER_SUPPLY == 1) 
  #define PS_ON_AWAKE  LOW
// 2 = X-Box 360 203W
#if (POWER_SUPPLY == 2) 
  #define PS_ON_AWAKE  HIGH
  #define PS_ON_ASLEEP LOW

//=============================Buffers           ============================

// The number of linear motions that can be in the plan at any give time.  
// THE BLOCK_BUFFER_SIZE NEEDS TO BE A POWER OF 2, i.g. 8,16,32 because shifts and ors are used to do the ringbuffering.
#if defined SDSUPPORT
  #define BLOCK_BUFFER_SIZE 16   // SD,LCD,Buttons take more memory, block buffer needs to be smaller
  #define BLOCK_BUFFER_SIZE 16 // maximize block buffer

//The ASCII buffer for recieving from the serial:
#define MAX_CMD_SIZE 96
#define BUFSIZE 4

// Firmware based and LCD controled retract
// M207 and M208 can be used to define parameters for the retraction. 
// The retraction can be called by the slicer using G10 and G11
// until then, intended retractions can be detected by moves that only extrude and the direction. 
// the moves are than replaced by the firmware controlled ones.

#define MIN_RETRACT 0.1 //minimum extruded mm to accept a automatic gcode retraction attempt

//adds support for experimental filament exchange support M600; requires display
//=============================  Define Defines  ============================

#if TEMP_SENSOR_0 > 0
#if TEMP_SENSOR_1 > 0
#if TEMP_SENSOR_2 > 0
#if TEMP_SENSOR_0 == -1
  #define HEATER_0_USES_AD595
#if TEMP_SENSOR_1 == -1
  #define HEATER_1_USES_AD595
#if TEMP_SENSOR_2 == -1
  #define HEATER_2_USES_AD595
  #define BED_USES_AD595
#if TEMP_SENSOR_0 == -2
  #define HEATER_0_USES_MAX6675
#if TEMP_SENSOR_0 == 0
#if TEMP_SENSOR_1 == 0
#if TEMP_SENSOR_2 == 0
  #undef BED_MINTEMP
  #undef BED_MAXTEMP


Dissolvable support material success!

I was able to print a support material test part with HIPS on the secondary extruder, and ABS on the primary. It printed OK, but I think the STL file I got had some errors (seems like most on thingiverse have errors).

I was able to break off some of the HIPS (in white) but there was still plenty of it stuck to the ABS. So Into the D-limonene bath it went overnight…see this link http://www.3dppvd.org/wp/2013/02/soluble-support-material/
I was afraid the limonene would possibly disolve the ABS some, as has been mentioned online before. but apparently that is more of an issue of cheaper ABS being made with Polysterene. But it’s nice to see that the lulzbot ABS is pure.

and here is what I got:

Has a nice fruity smell too :mrgreen:


this is where I got the d-limonene. http://www.amazon.com/d-Limonene-PURITY-Citrus-Solvent-Dlimonene/dp/B00508BM18
not cheap at $53 per gallon, but it should last for a while…I hope.


Thats really cool, hope to set something like this up. Already have the TAZ but been having all sorts of issues(user?) with it, waiting to get my shop finsihed and get the TAZ to its final location to get her going right.

Thank you for making the base design of the mount. I just remized it to work with a makerslide mount and will be testing it with 2 budda’s. I think the budda is the best nozzle on the market and cant wait to test out the dual setup.


We have these in the store now:


Jebba - any idea on when/if you’ll have fan accessories for this beastie? I’ve sort of rolled my own for now, but it’s a bit whacky (using a 24v DC blower fan - it’s TOO powerful!) And it looks like the firmware doesn’t support two fans? Even though the electronics certainly seem to, I can’t figure out how to make the second fan active.

I’ve pinged one of our techs to see if the current firmware supports it. Have you tried using the T0/T1 commands to switch between hot ends? Does the command:


turn on both fans? They’d need to be plugged into the E0 and E1 fan connector.

@Orias - nope. The fan connected to T0 (the extruder cabling that shipped with the TAZ4) activates, but T1’s fan does nothing. There’s an extremely tiny chance that I built my cable wrong, but everything else on it works fine so I doubt it. If your tech confirms that the firmware should work I’ll see what happens when I swap the cables around…


Looks like dual fan control isn’t in the firmware, I’ll get a version with dual fan control put together and throw it up here tonight or tomorrow depending on how long it takes. You’ll have a few options as to how to run them in configuration.adv, so you’ll be able to use them as heatsink fans, extrusion fans or a combination :slight_smile:


Great, thanks Bam! Now I have to decide if I should use them as extruder fans or run both heatsink fans (I’m using E3DV6’s) from one fan output…

Actually, random question. I haven’t dug too deeply into the firmware or the electronics hardware - I’m relatively sure there’s GPIO pins somewhere. I have a bunch of spare microcontrollers, is there an easy-ish (I’m perfectly happy coding things myself, if I know where to look) way to pull a pin high when the nozzle heat is above a certain temp, and low when it isn’t? I’d probably want two of them, one for each nozzle, at 5v or 3.3v, and then I’ll run a pair of relays out either directly from the pins or from my own microcrontroller.

That functionality is already in the latest Marlin firmware.
I have 3 independently controlled fans on my dual extruder AO-101. One each for the heatsinks and one nozzle ducted fan.
The hotend heatsink fans are configured in Marlin to come on when the hotend is above 120°C.
The print cooling ducted fan is controlled by slicer as before.

The later Rambo boards have the electronics to control 3 fans AFAIK. But the early Rambo in the AO-101 only has two. I’ve used the extra PWM GPIO pins to control a MOSFET for the 3rd fan. So I’ve got to know the Marlin firmware and Rambo electronics quite well I’ve the last few months.