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Unresolved Under extrusion issue

Discussion in 'Troubleshooting' started by Phillip Avery, Apr 7, 2016.

  1. Phillip Avery

    Phillip Avery New Member

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    So I had to replace the factory hot end, and I swapped it with this one I found on Amazon: http://www.amazon.com/RepRapDiscount-Hexagon-Hotend-1-75mm-nozzle/dp/B00W8FL5BS

    It's the exact same hot end, so I'm not sure why I'm getting problems. Anyway, after replacing, my prints are under extruding- it seems like it is most noticeable on the first layer. However, I'm thinking that it may not be under extrusion and maybe the nozzle is simply too high off the bed for the first layer? Either way a photo is attached and whoever can help me wins my eternal friendship. uploadfromtaptalk1460077787490.jpg

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    #1 Phillip Avery, Apr 7, 2016
  2. Tom Finzel

    Tom Finzel Member

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    try changing your offset to 0.8.
     
    #2 Tom Finzel, Apr 7, 2016
  3. Phillip Avery

    Phillip Avery New Member

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    That made it even worse... uploadfromtaptalk1460079004687.jpg

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    #3 Phillip Avery, Apr 7, 2016
  4. Tom Finzel

    Tom Finzel Member

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    hmmm, try this
     
    #4 Tom Finzel, Apr 7, 2016
  5. Phillip Avery

    Phillip Avery New Member

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    I measured the amount extruded and it was shockingly accurate (96 mm extruded instead of 100). I wouldn't think that 4% would cause the issues I'm having... Any other suggestions?

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    #5 Phillip Avery, Apr 7, 2016
  6. Geof

    Geof Volunteer Moderator
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    If your printing in pla you may have to season the hot end. Lots of threads on this. What's the nozzle size of your new hotend? The stock robo is .4. If yours is larger or smaller you need to adjust in your slicer
     
    #6 Geof, Apr 7, 2016
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  7. Phillip Avery

    Phillip Avery New Member

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    . 4 nozzle. What exactly is seasoning a hot end? Breaking it in?

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    #7 Phillip Avery, Apr 7, 2016
  8. Geof

    Geof Volunteer Moderator
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    Short term fix is to bump up the extrusion multiplier to see if it helps
     
    #8 Geof, Apr 7, 2016
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  9. Geof

    Geof Volunteer Moderator
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    Seasoning the way I do it (found when I got my printer) is to heat the extruded dip pla about 1-3" I to canola oil then run that through the heated hotend. Like seasoning a frying pan.
     
    #9 Geof, Apr 7, 2016
  10. Geof

    Geof Volunteer Moderator
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    #10 Geof, Apr 7, 2016
  11. Geof

    Geof Volunteer Moderator
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    http://www.thingiverse.com/thing:724219

    This is the oiler I use with a small piece of sponge per instructions on the page. I add 3-4 drops of oil....whenever I can remember at least 1x/week. Your picture does look a little like under extrusion so try adjusting that but def add an oiler to save yourself some grief
     
    #11 Geof, Apr 7, 2016
  12. Phillip Avery

    Phillip Avery New Member

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    So I tried lowering the z offset to - 0.1mm and let her run. Interestingly enough, the under extrusion seems to only be an issue with the first layer... What the heck could be causing this?

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    #12 Phillip Avery, Apr 7, 2016
  13. Geof

    Geof Volunteer Moderator
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    Getting the initial z offset can be very difficult. To high and you get gaps. To low and it just won't work. I think I moved mine closer to the bed .05 at a time then when it was to low I bumped it up by .2. Also check to make sure the nozzle is tight and the extruded is held in place securely, I'm sure it is but its worth a look.

    If your using the r1 or plus with auto level ,How do your end switches look? If your x axis isn't square anymore it will give you grief
     
    #13 Geof, Apr 7, 2016

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