I am currently filling carts for the 510 and I don't think it is that big of a deal, as everything I need for work fits in the PCC. The thing that interests me about filling blank cartomizers is keeping flavors separate. Currently if I swap flavors there is some carry over because some of the flavor stays on the atty (even if I blow it). Now it isn't that big of a deal for some flavors, as they complement each other. But some of the flavors do not really complement each other and I would actually like to taste apple w/o kona flavor 
My husband is currently using cartomizers from vapor king, he bought an adapter so that it fits on the 510 battery. I have also seen a few posts where people buy adapters and some posts were people just buy 510 cartomizers.
I am wondering if there is any difference between the two sizes - quality, flavor, amount of juice it holds, vapor production, life span or anything else that I can't think of at the moment. I would really prefer to not have to use an adapter but if there is a significant difference between the two I will probably just buy the adapter and hope that the thing doesn't fly out of my hands and land somewhere that I can't reach
If there is no real difference, I am looking at the 510 cartomizers from LitecigUSA unless anyone can suggest another place to buy them? Is there a difference in quality from different vendors?
My husband is currently using cartomizers from vapor king, he bought an adapter so that it fits on the 510 battery. I have also seen a few posts where people buy adapters and some posts were people just buy 510 cartomizers.
I am wondering if there is any difference between the two sizes - quality, flavor, amount of juice it holds, vapor production, life span or anything else that I can't think of at the moment. I would really prefer to not have to use an adapter but if there is a significant difference between the two I will probably just buy the adapter and hope that the thing doesn't fly out of my hands and land somewhere that I can't reach