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  1. #21
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    Have you checked the wiring is not compromised inside of the serial connector as one other has found a wire was squashed and had broken strands inside which directly effected his extruder stepper motor ?
    I have checked mine even moved the stepper wiring out side of the serial connector as there were very squashed in there.
    check out Joao post here : http://www.print3dforum.com/showthre...ull=1#post1205

  2. #22
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    Yes, I'm aware of this potential issue and I've opened DB9 and removed the stepper motor wires from it, they look fine and I tested them for continuity with the multimeter while bending the wires to ensure that no one is broken.
    Last edited by CrazyCoder; 01-04-2015 at 02:13 AM.

  3. #23
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    Can anybody print 10x40mmtower.stl with the following settings and post a photo like mine above?



    I want to compare the results.

    Can you notice the same diagonal pattern?

    I also noticed that the motors are very cool. Do your motors get warm or hot during this ~15 minute print? Cool motors can indicate that low currents are used for some reason which causes the uneven extrusion problem for me.

    Thank you!
    Last edited by CrazyCoder; 01-04-2015 at 09:07 AM.

  4. #24
    Administrator bolsoncerrado's Avatar
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    I will whenever i get my extruder replacement asap....

  5. #25
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    Quote Originally Posted by CrazyCoder View Post
    ......I found the position where it flips from the minimum to the maximum current (at the min level the motor almost doesn't extrude) and rotated it back to the max position......
    Can I ask, how do you tell when it flips from Min to Max, in case I or others need to make this adjustment?

  6. #26
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    You can find it only by experimenting. Rotate it CW very slowly, like 20 degrees at a time. This trimpot is one turn, so it will flip at some point. You need to find the spot when the motor stops extruding which will correspond to MIN. If you rotate it it 10-20 degrees CCW, it should start extruding again at full power. Once you know the spot where it flips, you can adjust between MIN and MAX.

    A better way would be plugging a voltmeter and checking the VREF that you are adjusting, but I'm not sure to which spots of the PCB it should be plugged. See http://reprap.org/wiki/Pololu_stepper_driver_board for details, our printer uses DRV8825.

  7. #27
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    @CrazyCoder - thanks for the info, will keep it handy for later.

  8. #28
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  9. #29
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    The same part printed on 2 different printers, Rapide 200 is on the left. You can notice that the outer wall is not as smooth because of uneven extrusion:


  10. #30
    Administrator bolsoncerrado's Avatar
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    Are your fans operating correctly, out of curiosity?

 

 

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