Yep post right above yours, my first cart the filler got stuck in the atty... which is really freaking me out since the filler is basically soaked in nicotine liquid...
The stock filler in 510 carts can sometimes stick, just be careful about pulling it out and making sure the little filler fibers are neatly tucked back in.
The relatively short cart time is an ongoing problem with 510s. There are some very simple mods you can do to help this out...some materials wick a lot better than the stock poly filler. If it is a clean atty and not flooded, it should draw about as easy as an analog. Usually gurgling or clogging is the atty, not the cart.
Look up the pyramid tea bag mod. There are threads here and videos on youtube. Basically you open up a tea bag, cut the bag material in a particular way, roll it up in a particular way, and then shove it into the empty cart and cut it off flush with the opening. Filler should, IMHO, be flush at the opening so that the atty bridge sort of pushes it in and makes a little bowl. This keeps the filler and liquid in contact with the hot bridge (it won't generally burn it), and wicking towards the bridge.
The straw mod is another easy one, also here on ECF somewhere. You get a little coffee-stirrer straw and cut it into a diagonal point on one end and flat across at the other end. Then insert it with the point in along with the PTB roll.
I use another material for 510 cart filler, a cotton tissue used for cleaning eyeglasses. I cut and roll it up like the PTB, along with a straw.
You get used to having a little dropper bottle of juice with you to top it off, either by dripping it in, or I sometimes use a blunt syringe to inject down into the straw, thus filling the cart from the bottom up. With the straw you are not wasting juice that is below the few mm that catually vape against the atty bridge, since the straw supposedly creates a sort of siphon effect and cycles the juice more than without the straw. Supposedly.
And as long as you are not using 54 mg juice, there is not really enough nic to be a big problem if it gets on your fingers briefly. Just wash it off.
I love my 510, but it does have issues like the subject of this thread. None the less, it is better than a lot of other models out there, and depending on the website you can get parts with a wide variety of colors and prices!
Happy vaping!
Kurt