This grainy print is relentless

[Commando]

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 :/

 

[Gino]

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

 

[chrisphilipps]

Can you post a picture of the issue?

 

[Solventinkjet]

Post a picture.

 

[Commando]

 

[Commando]

It seems like the "grain" effect is a lighter color blue

 

[Commando]

Took forever for my pics to go through. My service out here stinks

 

[Solventinkjet]

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.

 

[Gino]

Is it in solid colors only or does it happen in gradients or sharp lines in a letter of vector image ??

 

[Andy_warp]

Have seen this with stock that has too much moisture in it...

 

[Commando]

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..

 

[Commando]

3651-G same file, same heat etc

 

[Commando]

I just used a different file with multi colors and all kinds of shading and such and it did the same thing.

 

[Gino]

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

 

[Commando]

I did, Gino. Same thing.

 

[Andy_warp]

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

 

[Joe House]

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.

 

[C5 Service&Repair]

Looks like bi-directionals are off or a profile issue

 

[Commando]

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.

 

[gabagoo]

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