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@Butters
You got the Kayfun from Murts? Did you also get the mech mod? Is it still 18350 only?
In terms of building the Kayfun with silica, check out the Navy Nest build on YouTube. I haven't tried it, but it's supposed to be a really nice build.
I reckon 3 or 4 wraps of 0.2 around doubled 2mm silica will be fine. The key to Kayfuns is to avoid blocking the juice flow channels. Get that right and pretty much any build will work. Also, be careful of overfilling. It's a pressure feed system, so inhaling draws liquid into the chaber, through the wicks and up the chimney. If you leave it really full lying down with one channel in liquid and the other in air, it could flood. It doesn't happen often, but you will start to notice it after a few weeks and it took me ages to work out why. If you put it down flat, try to do it so the air hole is facing directly upwards. If it's not flat it doesn't matter - it won't flood.
If you have a mech mod now and can get the 18650 tubes, your batteries should be able to handle down to about 0.6 ohms safely. I've found the rip trippers double barrel build (on YouTube) to be a light and day change from normal microcoil setups. I reckon you will need to 2 x 8 wrap microcoils with 0.32mm kanthal around a 1mm drill bit to hit 0.6 ohms. Make sure none of the kanthal is touching the deck or you might get a short. Here's mine:
Get some 0.32mm kanthal at the very least if you are going 18650 mech mod microcoils on the kayfun. Some 0.28mm, some 0.8 x 0.1 ribbon and some 0.6 x 0.1 ribbon would also be useful at some point. Especially as the cost of all of the options in 10m reels probably comes to less than a tenner.
If you haven't got the RSST humming yet, I'd give 2mm 7x19 rope with a 2mm ekowool sleeve and ribbon wire wraps a shot. The ekowool prevents any problems with hotspots or shorts and it will give you about a 90% idea of what it is capable of. The last 10% involves a top cap reducer I reckon. It's worth that tenner, but you might decide Kayfun is the way forward and give up on genesis like a lot of people have. I think I might have given up too.