That's like saying 510 carts are designed to be disposable, so anybody who refills them is using them "outside of their designed for specs". Maybe several iterations ago, when the caps were really glued on, the manufacturers expected most cartos to be thrown away when empty, but that's not the case any more. Especially now with the easy 1-piece silicone caps, these things are made to be reused. They don't last forever, but what does?
yes it is...and first I was talking about KR808 cartomizers...so you cant really use 510 cartomizers to defend them... but yes with easy to remove silicone caps they are easier to refill, (I'm more prone to seeing that as an easy to fill blanks feature than a design for refilling)....but their design is still as disposeable...every manufacturer refers to them as disposeable cartomizers.....if they started to design where the filler material wasn't burning and more to a refillable/reuseable item