HP Printer not printing colors the same as a couple months ago

It typically does differ slightly as time goes by, but it shouldn't be a drastic difference. Are you printing at the same passes and ink density as before? More ink will make everything look darker. We always print the print mode and settings on our swatches when we do them so we have a reference. Same vinyl?

 

It's the last number in your media preset, 8p_CMYKcm_90 is 90% ink density.

When you first started printing that media, did you do a colour calibration first?

 

Is it the same preset, profile, etc. What rip are you using? What was your headlife then and now? Have you run any calibrations between then and now?

 

I just noticed it's a 315, not sure how colour calibration works on those, maybe someone with one can chime in.

 

Is it the same material?
where were the samples kept? if exposed to light it will fade.
Did you export using the same file type / settings?

 

Can you post pics of your tests?

 

my guess is head quality

 

Unless you calibrate directly before printing each swatch it's a toss of the dice.
The heads are consumables and wear quite quickly.
Even so the colour will change as they change temperature.

 

Don't know how it is in Flexiprint but we have had a couple of times employees selecting a 600dpi profile instead of 300dpi in Onyx Thrive resulting in colours that are off a slight bit. "Thought it would be higher quality" which is understandable but it differs from the 300dpi profile.

Other that that, as Bly and others pointed out, do color calibration before printing samples and swatch books to minimize differences.

 

You say you’re printing from Illustrator. What print settings may be different. I find Illustrator has a tendency to print dark and I have o go in and check every setting to correct it.

 

HP print heads are consumables (as you know) and they are slowly dying every single day....this is a common occurrence and can be viewed as a disadvantage for latex owners. The condition of your head from 2 months ago is different than the condition it is in today making it difficult to match exact colors over an extended time frame....especially on large solid areas. I'm not knocking the printer or the technology (for those die-hard latex lovers out there)...it's a great unit...but this is a slight disadvantage from their technology.

The same can be said about other print technologies (solvent/UV) but not to the same extent as those heads are meant to print for years, not months.

 

Try 3 or 4 thorough head cleans... I had a similar problem with dirty yellows especially, and dark blues, and browny reds, till I'd got rid of the black contamination that was muddying them all.

 

I'd be more concerned that he didn't run a calibration before he printed his swatches the first time. My 310 stays pretty consistent even with headwear. Another thing is enabling "Long Run" mode on your media. Without that enabled, the first prints off tend to be off as the machine heat isn't fully up. Learned that one doing vehicle wraps where the first panel came out differently than the rest.