How to Tell a Genuine HP45 Cartridge from a Rebuilt One

A rebuilt cartridge is an original body that has been opened, flushed, refilled and resealed. On a good day it prints.

The problem is not that it prints badly on day one. It is that the parts which fail are the parts you cannot see: the filter mesh already partly clogged from the previous fill, heater elements that have taken a few million firings, a nozzle plate wiped against a cloth more times than it was designed for.

So the failure mode is not “it does not work”. It is “it works for two weeks and then one nozzle drops out in the middle of a shift”. By then the cartridge is in the bin and the supplier has a plausible story.

What you can check in five minutes, without equipment

The nozzle plate under a loupe. The single most reliable visual check. A genuine plate has clean, uniformly shaped orifices with sharp edges. A rebuilt one usually shows polishing marks, a slightly dulled surface, or residue around the orifice rims — the physical evidence of having been refilled and wiped.

The seal and the cap. Factory sealing is done by machine and is uniform. Hand-rebuilt cartridges are resealed by hand, and it shows in the adhesive line: uneven width, a lifted corner, or different tape from the body’s original.

The ink meniscus and the colour. Look at the nozzle plate in good light. Genuine cartridges ship with a controlled meniscus. One that has been sitting refilled often shows a slightly proud or sunken meniscus, and the colour can be a shade off if a different formulation was used for the top-up.

The weight. A 42 ml industrial fill has a characteristic mass. A cartridge “filled to full” by eye is usually lighter. Crude, but a few grams of difference across ten cartridges is worth taking seriously.

What you cannot check without taking it apart

The filter and the heater elements. They are sealed inside the body, and a rebuilt cartridge typically reuses the original filter — which has already collected particles from the first fill. You will not see it from outside. You will see it as a gradual loss of nozzles over the following weeks.

Which is why the honest answer to “how do I verify a cartridge” is: you run a batch and watch the nozzle count over time, not look at it. A supplier who offers to send a single sample cartridge is offering the only test that actually resolves the question.

The commercial tell

Rebuilt cartridges appear at prices that are hard to explain. When a price sits far below the level at which a genuine 42 ml industrial fill can be manufactured, shipped and supported, the difference is being paid somewhere — usually in the filter and the heater elements, exactly where you cannot see it.

This is not an argument that all low prices are fraudulent. It is an argument that price is not the information you need. Ask instead for batch traceability, and for printed samples from the batch you will actually receive.

Four questions to send any supplier

Including us.

1. Is the cartridge a new body with a new filter, or a reused body?
2. Can you provide printed samples from the batch I will receive, on my substrate?
3. What is the batch or lot identification, and how far back does it trace?
4. If a nozzle drops out inside the first month, what is the replacement policy?

A supplier who answers all four in writing is one you can run a trial with. A supplier who answers three and deflects the fourth has told you something useful.

Where to go next

If you are still choosing between widths, the difference between 12.7 mm and 25.4 mm affects your code content more than the cartridge brand does. If the code will not hold on the material at all, that is a substrate and ink question, not a cartridge question. And if you want the ink options side by side, start at the cartridge range.

The difference is easier to check than to describe: how our TIJ ink cartridge factory is run covers the build, fill and test steps a rebuilt unit skips, and ink cartridge HS codes for your invoice matter once either one crosses a border.

If the question is what to look for inside the cartridge, it is answered above. If it is which supplier to judge, how to evaluate a TIJ cartridge manufacturer covers the questions to ask before the first order.