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How Low Do You Let Your Inks Get?

Discussion in 'Digital Printing' started by SCDesign, Sep 24, 2020.

  1. SCDesign

    SCDesign New Member

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    Aug 11, 2020
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    Hey all. I've been wondering how far I can push my ink cartridges. I'm using HP Latex 310, and the cartridges are 775 ml. I was told by my sales rep to replace inks as soon as the machine says they're low, which usually happens around 100ml. This seems kind of insane to replace such a huge cartridge with 1/8 of the product left in it. Then again, I'm not an expert, and I don't want to end up ruining printheads or getting air in the lines. Does anyone else using HP Latex have advice? How low do you let your inks get before replacing them?
     
  2. iPrintStuff

    iPrintStuff Prints stuff

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    I know pretty much every ink on the market generally has more than stated on the packet, so you can run them to “0” and they still have some left, for the specific reason of not letting air in the lines etc.

    I don’t have a HP but to me, leaving 1/8 of the ink in every cartridge seems a bit crazy! I’d definitely leave that in a lot longer.
     
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  3. StarSign

    StarSign Active Member

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    It's more about how quick you can get new ink vs pushing it to the limit. On one of our printers I always have 1 of everything on hand, on my flatbed we usually reorder when the bags are half full.
     
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  4. iPrintStuff

    iPrintStuff Prints stuff

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    For our Colorado I always keep approx 2 days worth of full printing - and we get inks in next day, the two days is just a precaution.

    The UV inks last about 1 year from the date we get them, but they usually don’t usually stick around long lol.

    how long to the HP inks last before expiring?
     
  5. P Wagner

    P Wagner Very Active Member

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    Many users of HP Latex printers drive the cartridges completely empty. When an ink color goes to 0, the user has about 30 minutes to replace the ink cartridge and the job will pick up and continue, in the vast majority of cases without any visible defects. If the inks are not replaced within about 30 minutes the job will be cancelled.

    It is important to begin the cartridge replacement at the printer front panel, as the ink delivery system is pressurized on HP Latex printers.
     
    Last edited: Sep 24, 2020
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  6. The Yanki & The Brit

    The Yanki & The Brit The Yanki & The Brit Signs and Radio Show

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    Of course they want you to get new ones when it sez your low! How do you think they make their money? Buy selling more ink!
     
    • Agree Agree x 2
  7. Solventinkjet

    Solventinkjet DIY Printer Fixing Guide

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    Do HPs not have an ink end sensor?
     
  8. P Wagner

    P Wagner Very Active Member

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    Yes, there are electronic ink sensors for each ink channel, located at the cartridge interface. Monitoring things like ink levels (as well as the amount of media remaining on the roll) can be done at the printer front panel, remotely on the computers on the local area network, or even more remotely through a smartphone app to deliver true mobility (see attached).
     

    Attached Files:

  9. Solventinkjet

    Solventinkjet DIY Printer Fixing Guide

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    Ok good! I couldn't believe what I was reading!
     
  10. chrisphilipps

    chrisphilipps Merchant Member

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    You should be good to use it till it says that it is empty. I personally haven't had any issues doing this on our demo units and customer haven't had issues either. The printer pressurizes the cartridge and reads the pressure on the ink system to detect how much ink is left.

    One word of warning is when the bag gets towards the end it isn't all that accurate on the display in regards to how much is remaining. It is always a good idea to have a backup on hand before they get below the 100ml mark. It isn't uncommon for it to drop about 20ml without warning as it rechecks the pressure on the cartridge.
     
  11. ikarasu

    ikarasu Very Active Member

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    Question for you... Very rarely has it happened, but I can think of twice now when I let it run to 0, and it ends up killing the head. Usually on the light heads, or magenta... I just had a head that was just swapped and working fine... It had about 130 ML through it, the ink ran out...I put a new one in and the head was completely dead, no ink running through it at all. I tried a few cleanings and nothing... I did a nozzle drop test and all nozzles were gone. I put a new head in and it worked perfectly fine.

    I just had it happen a week ago actually, it's been sitting on my machine waiting for me to RMA it... :D Just been too busy. Just wondering if this was a common thing, or if theres some other option I can do to recover the heads? 9.9/10 times its not an issue, just the odd occurrence that it kills a head.... which isnt a big deal since as long as its under warranty, it just means I get a new free head
     
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  12. greysquirrel

    greysquirrel Active Member

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    run it until the printer tees you its empty...run your heads until IQ is no longer acceptable...
     
  13. Print1

    Print1 New Member

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    You don’t have to replace as soon as it tells you too, however it’s shortly afterwards, once it starts sucking air you’ll be In for a lot of head purges. I’d say though you’ll want to run maybe 5% longer but that’s marginal. My Vutek I could run to 2% but those are very much different monsters
     
  14. balstestrat

    balstestrat Member

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    On HP the ink pouches should have zero air inside them so it can not suck air. Also those 775ml have no ink pump either. The ink is just being pushed out of the pouch. Imagine like trying to empty a small bag of ketchup. It will see that it's empty when no ink is moving anymore.

    Even with the big latex 10Liter bags you can go all the way to zero.
     
  15. Print1

    Print1 New Member

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    Until it reaches max negative pressure. Then there is a pressure Valve that will release to avoid blowing out the head. Obviously more extreme but it can happen. Usually the chip will run out before that though.
     
  16. balstestrat

    balstestrat Member

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    No the air pressure to push is constant, its not changing. The bag is just simply considered empty when its as empty as it gets with the normal pressure. There won't be negative pressure because there is no ink pump.

    So actually when you are running empty there is no way to explode your head because you have no ink you can not generate pressure in the ink line.
     
  17. JBurton

    JBurton Signtologist

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    We like to run out in the middle of the job here and just replace it mid print. Unless its expensive media in the printer.
    Onyx will tell me I may not have enough ink for the job when I get low or run a long job. Usually I just run it and ignore it if the ink level is over 50ml. The other day I ran a mostly burgundy print with 37ml left, then I laminated some stuff while it ran. It finished with 32ml left, even though it claimed it would run out.
     
  18. karst41

    karst41 Member

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    Do not run your inks to 0.

    I am very cautious about this and at 10% I run the replace Ink menu and pull the cartridge , then gently rock it. if it has ink you can feel it.
    If you can not detect ink in the cartridge, Replace it!

    If you detect ink you should know if that will be enough ink for the next job.

    30 ml is pretty much low as I will go.

    Now for the Scalding.
    Replace at 30- 40 ml. If you are trying to squeeze it down to 1% then
    you are pinching the wrong Pennies.
    You are paying $135 for a cartridge. Why you so Cheap?

    HP 9000 and Seiko Color Painter inks ran $240 - $280 for a 1L Cart.
    Then you had the wiper blades and solvents and, etc. etc. etc.
    These were very expensive printers to run and maintain.
     
    • Like Like x 1
  19. BluetailGFX

    BluetailGFX Journeyman

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    I tend to kick them out of the HP after they hit below 50ml. Had a couple instances like others have mentioned, letting it go to 0, and having a quality print issue or the head totally dies prematurely. I do keep some of the cartridges and will swap them back in for short runs to use up as much as possible. But no matter what, there is going to be solid debris in the last bits of any ink cartridge. Why test their quality control and risk your own production schedule for just a few pennies?
     
  20. JBurton

    JBurton Signtologist

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    I throw out enough 1/2 full light cyan and light magenta. I figure the printer will not run the last bit out of the cart, so as long as it tells me it has any ink, I keep hitting print. I have a full set of inks in the office and a couple more on top of the printer that will swap next time it's out, so I don't reckon I'm being cheap.
     
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