It takes a while to get it down, but once you do, no pre made coils can compare...I know drop in coils are darn good these days but back when I started vaping if you wanted a great vape, you had to do your own coils. Rebuilding is definitely a hobby and you need to be into it and devote some time to get it right, even now after 7 years of doing nothing but my own coils, sometimes I might add a touch more or a touch less cotton and the flavor suffers, but a quick redo and it's good to go.. imo the trickiest part is the wicking, because like I said, a few strands either way effects flavor....for me a small chambered single coil rebuildable rta is best like the kayfun mini v3, erlkonigin, gem, etc. A single kanthal coil at 2.5 ish mm ID sitting about 1.5 to 2mm above AF works best for me. Also AF in the mtl or restrictive lung inhales that's not to open, imo AF that's too wide open saturates flavor...I use 26g for the most part in the .7 to 1 ohm range and 28g in the 1.3 ish range....for me rayon has the best flavor....and wattages needs to be dialed in, in my builds they shine between 20 and 24 watts...good luck my friend ..btw, I do have a k5 and imo the chamber is just a tad big and although it's pretty good for flavor, it doesn't match my smaller chambered rtas
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