Extruder Motor Only Goes One Step?

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This topic contains 8 replies, has 3 voices, and was last updated by  Henry 1 year, 2 months ago.

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  • #13994

    Henry
    Participant

    So I just finished building my MPCNC yay!!

    But when testing I found a problem doh!!

    I printed the pieces out myself but the hardware/electronics/extruder were all purchased from vicious1.

    Without any filament in the extruder it seems to only move a single step and then back again when attempting to extrude/retract. It won’t go continuously in either direction. I get the same result with the hotend cold or hot, I tested both wondering if it was Marlin’s underheat protection but that doesn’t seem to be the case. I used a multimeter on the extruder motor wires to make sure the motor coils were wired in pairs correctly and that does seem to be the case.

    All the other axis/motors move normally. This is the second ramps based printer I have built so I’m not unfamiliar with the basic setup but I haven’t seen this problem before.

    I’m not sure what else to check.

    #13996

    Henry
    Participant

    I just realized that maybe my problem is that the extruder stepper driver might not be set to the right voltage. I setup the electronics board months before the rest of the machine was ready and I may have missed that step. What is the recommended voltage for the motor that comes with the mk8?

    #13997

    Henry
    Participant

    I just tried a range of voltages between 0.4 and 1.0 and it still just tick tocks back and forth.

    #13998

    Barry
    Participant

    Do you have any endstops wired?

    #14007

    Henry
    Participant

    No end stops are wired but I don’t see how that would effect the extruder motor. That should only affect the xyz axis.

    #14009

    Ryan
    Keymaster

    Do you have the resistor plugged in or the thermistor?

    There is a safe extrude temp set in the firmware that needs to be exceeded before it will move, 170C.

    #14024

    Henry
    Participant

    Thermistor is currently plugged in and reports expected temperatures. Attempted to extrude at 190C and I get the same result.

    #14026

    Henry
    Participant

    I just swapped the z and extruder stepper drivers around. The extruder now runs properly and…. to my surprise the z axis too. So I guess I have a solution. The voltages of both are about 0.6v so I’m not sure what the difference really is but I’ll take it.

    #14171

    Henry
    Participant

    And the next time I turned it on the z axis acted all wonky. It appears that driver is just no good. The likely postal strike in Canada is going to make replacing it a pain in the ass.

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