Extuder Heating problem

t4h3r · November 2016

hello

my extruder start cooling down after reaching the desired temp

so , i can't start printing

thanks

t4h3r · November 2016

#define PDM_FOR_EXTRUDER 0

#define PDM_FOR_COOLER 0

#define DECOUPLING_TEST_MAX_HOLD_VARIANCE 20

#define DECOUPLING_TEST_MIN_TEMP_RISE 1

#define KILL_IF_SENSOR_DEFECT 0

#define RETRACT_ON_PAUSE 2

#define PAUSE_START_COMMANDS ""

#define PAUSE_END_COMMANDS ""

#define SHARED_EXTRUDER_HEATER 0

#define EXT0_X_OFFSET 0

#define EXT0_Y_OFFSET 0

#define EXT0_Z_OFFSET 0

#define EXT0_STEPS_PER_MM 188.6

#define EXT0_TEMPSENSOR_TYPE 9

#define EXT0_TEMPSENSOR_PIN TEMP_0_PIN

#define EXT0_HEATER_PIN HEATER_0_PIN

#define EXT0_STEP_PIN ORIG_E0_STEP_PIN

#define EXT0_DIR_PIN ORIG_E0_DIR_PIN

#define EXT0_INVERSE 1

#define EXT0_ENABLE_PIN ORIG_E0_ENABLE_PIN

#define EXT0_ENABLE_ON 0

#define EXT0_MIRROR_STEPPER 0

#define EXT0_STEP2_PIN ORIG_E0_STEP_PIN

#define EXT0_DIR2_PIN ORIG_E0_DIR_PIN

#define EXT0_INVERSE2 0

#define EXT0_ENABLE2_PIN ORIG_E0_ENABLE_PIN

#define EXT0_MAX_FEEDRATE 50

#define EXT0_MAX_START_FEEDRATE 20

#define EXT0_MAX_ACCELERATION 5000

#define EXT0_HEAT_MANAGER 3

#define EXT0_WATCHPERIOD 1

#define EXT0_PID_INTEGRAL_DRIVE_MAX 230

#define EXT0_PID_INTEGRAL_DRIVE_MIN 40

#define EXT0_PID_PGAIN_OR_DEAD_TIME 7

#define EXT0_PID_I 2

#define EXT0_PID_D 40

#define EXT0_PID_MAX 255

#define EXT0_ADVANCE_K 0

#define EXT0_ADVANCE_L 0

#define EXT0_ADVANCE_BACKLASH_STEPS 0

#define EXT0_WAIT_RETRACT_TEMP 150

#define EXT0_WAIT_RETRACT_UNITS 0

#define EXT0_SELECT_COMMANDS ""

#define EXT0_DESELECT_COMMANDS ""

#define EXT0_EXTRUDER_COOLER_PIN -1

#define EXT0_EXTRUDER_COOLER_SPEED 255

#define EXT0_DECOUPLE_TEST_PERIOD 0

#define EXT0_JAM_PIN -1

#define EXT0_JAM_PULLUP 0

#define FEATURE_RETRACTION 1

#define AUTORETRACT_ENABLED 0

#define RETRACTION_LENGTH 3

#define RETRACTION_LONG_LENGTH 13

#define RETRACTION_SPEED 40

#define RETRACTION_Z_LIFT 0

#define RETRACTION_UNDO_EXTRA_LENGTH 0

#define RETRACTION_UNDO_EXTRA_LONG_LENGTH 0

#define RETRACTION_UNDO_SPEED 20

#define FILAMENTCHANGE_X_POS 0

#define FILAMENTCHANGE_Y_POS 0

#define FILAMENTCHANGE_Z_ADD 2

#define FILAMENTCHANGE_REHOME 1

#define FILAMENTCHANGE_SHORTRETRACT 5

#define FILAMENTCHANGE_LONGRETRACT 50

#define JAM_STEPS 220

#define JAM_SLOWDOWN_STEPS 320

#define JAM_SLOWDOWN_TO 70

#define JAM_ERROR_STEPS 500

#define JAM_MIN_STEPS 10

#define JAM_ACTION 1

Repetier · November 2016

Check the log if it detected a decoupling and simply turned it off for that reason. That you can adjust extruder settings to handle this better. Default values do not work on all extruders. Some swing more, others heat slower. So you might just need to adjust decoupling variables accoring to log message you get when it happens.

t4h3r · November 2016

no error appears during heating or printing

and temperature curve looks alright

but the filament is stuck inside the hot end

i try to clean it a lot of time but i always got the same problem

Israel · November 2016

What is the highest temp you ever loaded? You may have burnt up the PTFE tube in the barrel of the hot end.

Repetier · November 2016

Clogged extruder is not automatic cooling down when target reached, so that problem is gone?

There are many reasons for clogging, so hard to say what it was. Typical it is filament melting to high up blocking extrusion. Sometimes cheap filament has small garbage blocking nozzle. In any case clean up nozzle and check manually if you can push filament through the nozzle. This is also a good test to find the correct temperature as you feel how much force it takes.

t4h3r · November 2016

i had clean it then try manual feeding

it works alright with 400 ْ

is that's alright ?

Repetier · November 2016

What are you extruding? Most extruders are defect at 400°C. PLA prints at 180-200°C. Our default maximum temperature is 275°C for that reason. Exceeding max. temperature turns extruder off.

t4h3r · November 2016

Chinese one

i know the pla prints at 180-200 but it does not melt with me at 200 - even 280

WhiteRenard · November 2016

If doesn't melt even at 280 and you know it's not clogged, you probably have misconfigured the temp sensor.
Also, does your PTFE tube go down all the way to the nozzle/heatblock? If so, it's not all metal and you should never exceed 240-245C.
Past that temp, PTFE starts to deform and melt and not only will it clog, it'll also produce some nasty toxic fumes.
Don't trust the Chinese hotends.

P.S. After you try to extrude some filament, pull out the filament, does the end look like a plug? Do you have a fan on your hotend's heatsink?

t4h3r · December 2016

thanks guys

i got a new extruder and it works great

Extuder Heating problem

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