ALERT 1 – Needle caught and stretched
If there is a major overflow or sort of explosive spurting of an Epson cartridge, the most likely cause is that the needle got caught in the septum plug and instead of penetrating nicely through the slit, it stretched the part out so far that it never was able to get fully open inside the cartridge. When we start dispensing in this case, the ink cannot make it inside the cartridge and can instead is shot right out the top of the plug.
A process hint to operators would be, as the injector is inserted into the adapter at fill, before twisting the injector into a locked position, make sure that it does not “bounce†back up on its own- this is a clear indication that the septum is stretching rather than being properly penetrated. If the operator does encounter high resistance or bounce, replace the plug before filling.
ALERT 2 – Clogged Hole
One other thing to keep an eye on, if sites are having multiple occurrences of minor overflows that stream down the back of the cartridge (still a cause to fail the cartridge), you may want to replace the adapter and inspect for clogging of the prep flap- the hole in the prep flap on Epson is very small so you will want to be sure that you are not getting too high an occurrence rate of clogs.