No such thing as a "free" wide-format inkjet.
I've had quite a bit of experience with these beasts over the years, and for all of the combined experience and intelligence of mankind, they have seemingly been unable to make one which doesn't have high maintenance and costs associated with them.
But if anyone is crazy enough to get one (or just can't get by without one) the main thing to understand is that they are designed with the expectation that they will be used many times a day, every day. Some even have a timed cycle to push ink through the heads (and usually a fair amount) when left unused, which means that the often costly ink is basically flushed down the drain if you aren't printing something. While this isn't ideal, the alternative is costly on-site maintenance calls, and replacement of expensive print heads, sometimes on the order of $1200 each or more. And in the case of the ones which produce really nice prints, there can be up to 8 of them. "Free" or cheap printers are usually those which have had the heads dry up and the cost to fix the issue outweighs their value.
They also have long timing belts with small rubber teeth. As the belts age, or in the case of solvent printers, are exposed to vapors from the inks, they tend to harden and become brittle. It's not uncommon to fire up an older printer and suddenly find pieces of these teeth being deposited onto your print. The belts aren't too costly compared to the heads, but it's usually a 2 hour job to replace one and recalibrate.
That doesn't even begin to address the cost of the consumables. While 3rd party inks have become a lot more available, few possess the temerity to risk the heads to such unknowns. But some do, and with constant and proper use, can make them work. Then there's the special papers and such, which can really only be considered economical when purchased in bulk quantities. Nothing stings worse than being 85% into a large print on fancy material and running into a print issue, which causes it to end up in the trash can.
In short, if you don't want to spend a bunch of money and begin a new occupation as a printer technician, farm out your large format printing to someone who does it for a living.
You're welcome.