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Homing goes bottom left instead of top right

I assembled my Emblaser yesterday and everything works fine, except that homing with UniversalGcodeSender V1.0.8 tries to go bottom left. This doesn't trigger the end stops and leads to infinite belt skipping.

I can only circumvent this by manually moving the carriage into home position.

What have I done wrong?


  • Hi Felix,

    Can you double check your belts are correctly installed and going around the correct pulleys etc.

    Can you enter the $$ command and copy/paste the results returned for us to review.

    That will be the first place to start.
  • Belts, pullys and motors are installed as in the asssembly guide.

    **** Connected to COM5 @ 115200 baud ****

    Grbl Darkly Labs A4 Ver1.8 ['$' for help]
    ['$H'|'$X' to unlock]
    >>> $$
    $0=10 (step pulse, usec)
    $1=25 (step idle delay, msec)
    $2=0 (step port invert mask:00000000)
    $3=2 (dir port invert mask:00000010)
    $4=0 (step enable invert, bool)
    $5=0 (limit pins invert, bool)
    $6=0 (probe pin invert, bool)
    $10=3 (status report mask:00000011)
    $11=0.010 (junction deviation, mm)
    $12=0.002 (arc tolerance, mm)
    $13=0 (report inches, bool)
    $14=1 (auto start, bool)
    $20=0 (soft limits, bool)
    $21=0 (hard limits, bool)
    $22=1 (homing cycle, bool)
    $23=0 (homing dir invert mask:00000000)
    $24=25.000 (homing feed, mm/min)
    $25=2000.000 (homing seek, mm/min)
    $26=250 (homing debounce, msec)
    $27=1.000 (homing pull-off, mm)
    $100=200.000 (x, step/mm)
    $101=200.000 (y, step/mm)
    $102=200.000 (z, step/mm)
    $110=10000.000 (x max rate, mm/min)
    $111=10000.000 (y max rate, mm/min)
    $112=10000.000 (z max rate, mm/min)
    $120=1000.000 (x accel, mm/sec^2)
    $121=1000.000 (y accel, mm/sec^2)
    $122=1000.000 (z accel, mm/sec^2)
    $130=300.000 (x max travel, mm)
    $131=210.000 (y max travel, mm)
    $132=10.000 (z max travel, mm)
  • These all look correct.

    Can you please check the wiring of the motor cables matches this image: Wire connection colors.jpg?dl=0
  • I dont know if this is related, but there's a jumper labelled "microstep jumpers" and in the manual it appears to be set to M1 whereas mine is set to M2.
  • The wiring on the short cable appears to be wrong, its blue red black green with my cable, can i just swap black and green?
  • Yes. Carefully use a pin to unclip the connection and swap then around.

    Let me know if this resolves it.

    Sorry for this mixup.
  • Also, the microstep jumper should be on M1.

    This would not cause the problem you are seeing, but would result in the machine not moving at the correct speed.
  • I swapped the cables and it works perfectly now!
    However changing to M1 caused the carriage to try to go over its limits.
    So i guess M2 was right anyways? (I have the A4 model btw.)

    Anyway thanks a lot!!!
  • Ahh.. sorry.. Yes.. Should be M2.

    Glad it's working. Apologies for the cable mixup.
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