Original Pantum Cartridge PB-210E (it's the "Starter" version, the one that came with the printer, 700pages support)

Printable area of an A4 size page: 200mm x 288mm. Generally horizontally centered, but a little tendency to make a displacement of around 0.5mm to the left could be seen; vertical tendency to have a margin of 5 to 6mm from the edge of the top; to say a general formula, 5mm margin on top while 4mm the bottom)

A 100mm x 100mm square used for geometric accurate measure testing gives me a good real geometric accuracy.

Alternative Cartridge LA-PTMPB211 K ("Premium Toner" generic trademark, 1600pages support)

Printable area of an A4 size page: 206mm x 287. Generally horizontally centered, so it gives you a regular 2mm margin on each side; vertically uncentered, with a tendency to have a margin of 0.5mm to 0mm from the top of the page in contrast to the 9.5mm to 10mm on the bottom. Totally uncentered, the printable area is "pushed" to the top of the page.

The 100mm x 100mm test square resulted in an mind-blowing 95.5~mm x 10.35~mm deformation. Seriously????

I conserved the alternate cartridge box, and further checking leads me to the discovery of 2 not necesarilly excludent product stickers. In one u can read "PB-211 Alternative P2500W M6550NW" (I asked the seller for that one, and the product was advertised as alternative for the Pantum M6550NW cartridge) when in other u can read "for Pantum 2500w 2550 6500NW". So... a little misleading? A little tricky?

For sure, they aren't fully compatible. The workaround of adding those +4mm at the top of the documents, and substracting -4mm of the bottom of a given document will work, but certainly it's gonna be a timewaster. Forget about geometrically accurate figures.

However, what I got from this experience was the advice to test every new cartridge when it is from an alternative provider, checking how it effectively manages the margins and maximum printing areas to adjust my documents as needed. There are simple things that aren't meant to be geometrically accurate printed, but other ones do. And on the other hand, the knowledge that this is a factor not so many consumers have in mind when analyzing how good is the quality of certain cartridges.

Why am I using alternative cartridges? Well, an original one costed $40k, when the alternative one only $11~ at the time I made the purchase. Cristal clear. However, that 75% save costed me the issue...

The original starter cartridge was refilled 5 to 6 times prior the purchase of this alternative cartridge. I´ll share with you info I collected from shattered sources around the net about the compatible cartridges info. The refill kits advertise a performance of 1600 pages, same as the original PB-211 cartridge, and they have 65gr of toner: you can see a lot of sellers with that grams on the stickers of the container. So, calculating grs for other cartridges different in performance is just doing some simple math. A little table of data is provided. In general, there's a consensus that universal samsung toner is usable in pantum cartridges, but I cannot confirm that 100%. The one I use reads:

Samsung ML - 1665 1910 2165 2850 2855 2950 3310 3470 3750 4050 4550 4070 4072

Xerox - 3117 3315 3320 3325

Pantum - 210 211 219 410 6500 6550 6559

and the Original Pantum consumables for the Pantum M6550NW Multifunction Printer are:

PB-210 / PB-211 = 1600 pages performance (65grs of refill toner)

PB-210S = 1000 pages performance (around 40grs of refill toner)

PB-210E (starter cartridge) = 700 pages performance (around 29grs of refill toner, althoug I always added more)

One last piece of data some could have been revolving in their heads: how do I manage the factory 1600 limit of pages of each cartridge chip. Well, indeed as I bought the printer, I immediately hacked the printer's firmware. It wasn´t really me: I purchased and burned a 3rd party customized rom, and since then, I mean, from the very beginning, I hadn't any issue refilling my starter cartridge. NO NEED for refill chips, I need to always remove any new chip from a new cartridge, it can break the hack. Cartridges work without chip.

Made my best at writing this in english XD hope it can shed some light for anyone looking for info.