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Discussion Starter · #1 ·
Hi,

We have a print quality issue with our new HM1. Please see attached example. This is a print on a green t-shirt with white ink underbase. Seems to be doing this with all prints, cmyk and white ink. Did a nozzle check. Nozzle check 100%, cleaned the encoder strip, did auto head alignment, many head cleans etc. Any ideas of what this could be or what we could check.

Thanks in advance,
Riaan
 

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Discussion Starter · #2 ·
So we tried everything again, head cleans, encoder strip, head alignment, different image files, different print settings, no luck. We still get 100% nozzle check paterns. Where to from here? Any ideas please.

Riaan
 

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Discussion Starter · #6 ·
Yes, the wiper blade is clean. We clean everything before and after we print for the day.
 

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Discussion Starter · #8 ·
We went over the printer and made sure everything is 100% clean, including the obvious parts such as the wiper blad, capping station, printhead, encoder strip, no dust, no ink "over spray" nothing. The machine has printed less that 100 shirts and is still spotless clean. Nozzle checks and head cleans performed again, no luck. Tried to print from Photoshop and not through PrintPro, same results. Not sure what else we can try. Can it be a clogged printhead even if the nozzle check is 100%?
 

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After running a cleaning cycle take a look at your print head with a mirror and flashlight. If you see any residue on the print head it could be that the wiper blade has become warped. A new one would solve that issue.

If it is doing this only on prints over a white underbase ( not my area of expertise) I would suspect too much white ink in the layer.

If it is doing this when you print solid images each of 100% c,m,y, and k on a white shirt I would suspect a problem in the ink flow- probably not the print head with perfect nozzle checks, but perhaps a clogged air vent, damper, or somewhere else between the ink supply and the print head. All colors being involved would also make me think of the whole capping station and pump. I have different printer so I am trying to apply that information to your printer in case it may be of help.
 

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Have you tried printing with the bed a little lower? it looks to me like your print height might have something to do with it or maybe even the ink you are using. Do you know which ink you are using? Also is your spit station on the left emptied? if it gets full and you dont have it empty, excess ink can get on your printhead from the foam pad. Has this been happening since you got your machine or did it just start?
 

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Discussion Starter · #12 ·
Hi there,

The machine printed fine the first 3 weeks, mostly getting to know the machine etc. The last perfect print was Friday night, really nice solid white background with colour layer. Next day the coloured t-shirt prints started with the banding. Wiper blade seems fine, and clean. Sponge on left had side clean. We really keep everything clean as we studied all the post from you guys before we purchased the machine and we know the saying, no hoove no horse, in this case, no maintenance no working machine and no income.

Last night we printed a colourful clipart image. Exported from Corel at 350di, ended up being a 51mb file, printed this on a black t-shirt. White layer printed 100%, colour layer 99%. Printed some more cmyk and its seems as if the ink flows better, but the still banding. Printed a few colours and it seems as if the magenta range of colours are worse than others. Ink bottles are always way above half. Will follow through on your suggestions and let you guys know.

Thanks again for all your valuable input.:)
 

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If I were you and you say its the magenta colors that are having the problem, maybe try flushing your system with a mix of distilled water and cleaning solution, because maybe you might have a bit of buildup in your damper, that might be slowing the flow a bit. Also is this the only file you are having this problem with? Or does this happen with other files as well. If it happens with other files, I would suggest either flushing your system just in case there may be some buildup in the damper, or just replace the magenta damper.

If this is the problem, simply replacing the magenta damper would be the easiest and fastest fix. If you have the time I would try the flushing method just to give a good cleaning to all dampers and the print head thru the inside :) I do a flush on my system every 4 to 5 weeks just as an added part of my maintenance to keep any buildup out of the system. The fact that you are getting banding within that color range, may be just a bit of buildup.

This can especially happen if you are printing a lot, or there is any type of debris in the ink at all. If you are worried it might be the ink you can always strain the ink with a coffee filter when putting it into your bulk bottles. I cant say because I of course am going to have different ink then you, but I have heard of this happening, especially if you might have gotten ink that the distributor may have had in stock for awhile. Hope this helps :)
 

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I've posted about the magenta banding problems over a year ago, and still I have no fix for it. The only real solution I have found is to print at 1440dpi.
 

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Quote from a tech:

"I have seen this problem (yellow streaks on red prints) with just about ever
2100/220 printer, "when printing the DTG Red Hot Rod print", but haven't
really chased it through as yet."

Thats referring to the 2200 printhead in the original kiosk. But still might be a problem with the HM1 printhead as well?

What RIP are you using?
 

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Discussion Starter · #16 ·
Wow that is not good. I have PrintPro. Will try printing at 1440, but that may put down to much ink in some cases?
 

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Hmm, could Print Pro be the problem since I don't hear many issues from Rip Pro users. 720dpi does not lay down the ink as well as Rip Pro does (I've done side by side comparisons).

1440 will lay down a bit to much ink for the white layer. The method to combat this is to reduce your colors or increase your brightness by about 20% before printing.
 

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I was just going to say the same thing zhenjie :) I have rip pro and have had no problem like this at all. I am wondering if it is a glitch in print pro. That is a very good possibility as I have not heard of anyone with rip pro having this problem.
 
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Discussion Starter · #19 ·
I tried printing 1 pass at 1440 (use to print 2 passes at 720) and yes it made all the difference in the world. No banding as far as I can see, even after reducing the image back to 200dpi. White layer a little heavy, but I will try zhenjie's suggestion on this too. Thanks everyone for your suggestions and time to get us back in the game.
 

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Glad to hear your getting better results Riaan :) Thats what were here for, is to help each other get the best results possible.
 
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