Finally, refilling cartridges is a thing of the past!

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That is a considerable saving ! so all you've done is tape in some tubes & then shove them in some ink bottles ?

Generally you come up with some 'whacky notions' .. but I actually like this one !

(& I can't say I've seen anybody do this before either, as anybody using 'lots of ink' is generally using commercial grade printers which are much much more ecconimical than some 'crumby inkjet')

The cartridges for these printers are basically just a box with an ink bag inside and a spring loaded pump under the cartridge, inside the printer a sort of piston comes and presses the pump under the cartridge in and out to pump ink to the printheads, what I did was open the refill hole inside the cartridge and inserted a tube in each of the 4 cartridges and sealed them with hot glue, after being careful of getting all the air out, I connected the other ends to ink bottles in which I have made a very tiny hole (much smaller than a pinhole) to let air in the bottles as the printer pumps out the ink. This also answer how it gets the ink uphill, these HP business printers have inkpumps so it won't have any problem pumping the ink.

This is a business/commercial inkjet printer, I've looked at other lasers but the toner cost doesn't make them an option for me when I can get better quality for much much cheaper with commercial inkjets.

I can tell you from experience that what might be going on here is that the ink in the cartridges is what you are printing from, and you will find once it runs out, that nothing is actually being "pulled" from the bottles.

When a pump goes bad on a plotter, or a vaccum leak occurs, you don't notice right away as the printheads hold some ink, so until you deplete whats in them, you don't realize there is a problem.

These HP business models use ink pumps so it's be able to pump the ink uphill, the only thing is that the way it normally detects when it's out of ink is when the piston on the cartridge doesn't spring back out (meaning there's no more ink left to let it fill up), so I'll have to make sure I don't let the ink bottles run low or it'll start pumping in air which could damage my printheads if enough air gets in.

This lets me print color pages at $0.004 (0.4 cents) a page, I don't know of any other printer type with costs anywhere near this low, but of course if I was buying cartridges the cost would be more, but still half the cost of laser. I will still have to replace the printheads but they are rated for 24,000 prints and the seller I buy my ink from is getting a lot more than this.