Why are some ink jet carriages refillable and others arent? -

I know it s pretty much a strategy at this point for companies to make their cartridges non-refillable but how are they doing this?

Some are using smart chips to make their cartridges non refillable and others are using fuses. Most re manufacturers can reverse engineer a smart chip and reset it, however smaller re fillers and home users cannot. This is usually becuase reprogramming a cartridge either requires replacing a small chip or physically programing it using some very expensive equiptment. As for the fuse, this usually cannot be easily overcome. It usually involves completely dismantling a cartridge and replacing the fuse without damaging the cartridge which is a near impossibility due to the size of the parts one is working on.

Inkjet printers are mainly of 2 types - in one type there is print head and toner for which the cartridges are used and refilled after use and in another type the tonar is biult in with the printer head, thus for this cartridges used are not refilled but the whole print head has to be replaced thus for such types of printers non-refillable cartridges are used. Also please use such printers because they are cheaper than refillable ones