Hotend temperature dropping while executing other comments

  • Hi,

    I already am struggling for some time with the fact that the temperature of my hotend is dropping while executing other comments. The code below is the first part of the gcode that is executed.
    The part that is crossed out is added by a custom script I made within simplify3d.

    M106 S0
    M140 S60
    M190 S60
    M104 S205 T0
    M109 S205 T0
    G28 ; home axis
    G92 E0;
    G92 E0;

    G92 E0
    G1 E-5.0000 F1800
    G1 Z0.135 F2000
    ; layer 1, Z = 0.135
    ; tool H0.150 W0.480
    ; skirt
    G1 X-8.155 Y6.641 F2000
    G1 E0.4000 F540
    G92 E0
    G1 X-8.143 Y6.662 E0.0007 F960
    G1 X-6.700 Y9.498 E0.0960
    G1 X-6.690 Y9.519 E0.0967

    Here you can see the temperature for the hotend is set to 200. This is reached and controlled nicely. When i started the print the temperature rose to 225 and afterwards it keeps dropping while the hotend is moving towards the buildplate. In some way the system does not control the temperature anymore and falls into an error after dropping 15 degrees below the set temperature. Sometimes the hotend reaches the buildplate before this error and then it starts to heat up again and starts printing after the set temp is reached.

    Does anybody know what is going on and how to fix this?

    P.S. this also occurs when executing bed leveling for example

  • Moderator

    Note that is says the word FAULT under the heaters. Check the gcode console for an error message indicating what type of heater fault you're experiencing.

    Is your thermistor and heater cartridges secured tightly? Is a wire getting pulled during the movement?

  • As @Phaedrux said. I'd say it's a 90% probability that you have poor connection, probably a bad crimp that makes or breaks the heater circuit when the print head moves.

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