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This grainy print is relentless

Discussion in 'Mimaki' started by Commando, Sep 30, 2019.

  1. Commando

    Commando Member

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    Oct 11, 2013
    Tennessee
    Everything I have done; an overnight soak, filled up ink, hard cleans, long nozzle washes, the drop pos alignment, everything is clean (cap station, head) Hasn't helped at all!
    My test prints are perfect, minus 2 or 3 missing lines. Just happened all of a sudden in between printing a golf cart wrap.
    Is there something else I can do? Im scared I will need a new head :/
     
    Tags:
  2. Gino

    Gino Premium Subscriber

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    Could yopu post some pictures..... of the bad prints ?? Closeups so we can see.
     
  3. chrisphilipps

    chrisphilipps Merchant Member

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    Can you post a picture of the issue?
     
  4. Solventinkjet

    Solventinkjet DIY Printer Fixing Guide

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    Aug 2, 2011
    Denver, CO
    Post a picture.
     
  5. Commando

    Commando Member

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    Oct 11, 2013
    Tennessee
    Resized_20190930_105928_8943.jpeg Resized_20190930_105919_1149.jpeg Resized_20190930_105919_1149.jpeg
     
  6. Commando

    Commando Member

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    Oct 11, 2013
    Tennessee
    It seems like the "grain" effect is a lighter color blue
     
  7. Commando

    Commando Member

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    Oct 11, 2013
    Tennessee
    Took forever for my pics to go through. My service out here stinks
     
  8. Solventinkjet

    Solventinkjet DIY Printer Fixing Guide

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    Denver, CO
    Looks like possibly a heat or material issue. Has the shop environment changed recently? Try printing the same thing on different material and see if there is a difference.
     
  9. Gino

    Gino Premium Subscriber

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    Is it in solid colors only or does it happen in gradients or sharp lines in a letter of vector image ??
     
    • Agree Agree x 1
  10. Andy_warp

    Andy_warp Member

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    Seattle, WA
    Have seen this with stock that has too much moisture in it...
     
  11. Commando

    Commando Member

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    Oct 11, 2013
    Tennessee
    I just used the same file on 3651-G and it still has it. Granted, it doesn't seem as obvious.
    If it is a heat or material issue, why would it just start like that? I had already printed 3 big sheets with same profile on the same material and they looked perfect..
     
  12. Commando

    Commando Member

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    Oct 11, 2013
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    Resized_20190930_105928_8943.jpeg
    3651-G same file, same heat etc
     
  13. Commando

    Commando Member

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    Oct 11, 2013
    Tennessee
    I just used a different file with multi colors and all kinds of shading and such and it did the same thing.
     
  14. Gino

    Gino Premium Subscriber

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    Try a TOTALLY different file and see if it still does it.
     
  15. Commando

    Commando Member

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    Oct 11, 2013
    Tennessee
    I did, Gino. Same thing.
     
  16. Andy_warp

    Andy_warp Member

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    Do you have some unopened stock...that has been sealed from moisture?
     
  17. Joe House

    Joe House Active Member

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    Have you tried printing unidirectional? Double check your calibrations. Also, when things happen "all of the sudden" check your environment. If the temp is higher in your shop, or humidity lower, the ink will dry before it has a chance to spread out like normal. I've also seen static electricity cause this when the humidity is at the margins of recommended levels.
     
    • Agree Agree x 2
  18. C5 Service&Repair

    C5 Service&Repair Member

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    Jan 14, 2018
    Omaha, NE
    Looks like bi-directionals are off or a profile issue
     
  19. Commando

    Commando Member

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    Oct 11, 2013
    Tennessee
    I only print unidirectional. I haven't printed anything bi- in years.
    I had a static problem a year or 2 ago and seemed to have fixed that.
    Late yesterday afternoon, I realized the multicolor print I did all had cyan mixed in the colors. So I did a print with colors that wouldn't contain cyan and the prints were perfect. It seems to be that my cyan nozzles are shot.
     
  20. gabagoo

    gabagoo Major Contributor

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    Vaughan, Ontario
    Can you slow down the speed of the print and run more passes?
     
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