Canon printers will pause and prime the print head once in a while if you command it to print continuously. The printer keeps track of printer activity and it knows when the print head needs to take a break when it becomes necessary to prime the print head by doing a cleaning cycle. So continuous printing should never be a problem if you are using OEM cartridges or if you refill OEM cartridges. 4 or 5 successive multiple refill of OEM cartridges should not be an issue either. This is why 3rd party ink/cartridge vendors continue to survive and this is why we believe in refilling and this is why this forum exists. Or we would have made a simple conclusion long time ago - don't use 3rd party supplies. And then this forum would have ended at the time we made that conclusion.mikling said:Tin Ho, I initially did not have any problems, only after successive multiple refills. So yes, my refills print like OEM as well continuously. Please read the complete experience.