I had this same issue too - was driving me mad. On a Mac your printer automatically sets up as an Air Printer. You can see if it is by going to preference and selecting your 8550 and if it says air print EPL won't see it. You need to delete the printer and then you need to click the + button select the 8550 but then click Select Software and then a list pops up and then select 8550. It then installs from the driver and the air print thing goes away. Restart EPL and you will be able to see your 8550. I might not have explained this well so if you search support apple update printer software a printing problem it should come up with the page on apple with all the info.
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