How to Wrap a Nano Microcoil with Cotton Bed for a Vortex RDA

This tutorial is going to cover how to wrap a nano microcoil for a Vortex RDA with a cotton bed.

The Vortex is a really cheap RDA that you can get on Fasttech here.  This tutorial would work with a lot of other atomizers besides the Vortex. This just happened to be the one I am playing with at the moment.

So the difference between a nano microcoil and a regular microcoil is that the nano coil has an extremely small diameter. For example most standard microcoils I wrap, I tend to use either a 1/16 drill bit or a 3/32 drill bit. Both have a significantly bigger diameter than the coil I wrapped for this tutorial. By having a smaller diameter, we can make quite a few more wraps and extend the surface area that will be in contact with the wick.

For this tutorial, I am going to assume you already know how to wrap a microcoil. If not, you can learn more about them here.

What You’ll Need

  • 28 gauge Kanthal wire. You can use a different gauge, but your results WILL vary. I highly recommend 28 gauge.
  • Cotton ball – I recommend picking up a bag of Sterile Cotton Balls from CVS. It will only cost a couple dollars.
  • Something very small diameter to wrap the coil on. I used one of the tiny allen wrenches that came with an atomizer. You could also use a straightened out paperclip or something similar.
  • Something to trim your wires with – I use a nail clipper, wire cutter or scissors
  • Something to check ohms with

Step 1 Wrapping and Attaching the Coil

You’re going to want to wrap a very tight and small coil. I used a tiny allen wrench that I got with an RBA from Fasttech. A straightened out paperclip would be a good alternative. Go ahead and tightly wrap your coil. For mine, I made 12 wraps.

You want each wrap to touch as closely as possible. It’s ok if it’s not perfect right now because you can correct that in a moment.

You should have something that looks like mine below.


Once you’ve wrapped your coil you have 2 choices – you can take it off the allen wrench, hit it with a lighter until it glows orange, and then gently compress the coils together until they are all tightly touching…


You can attach the coil to the atomizer, check your ohms, then dry fire it until it glows orange, then compress with a pliers.

Personally I prefer the latter whenever possible. Especially with a nano coil because once you remove it from the device you wrapped it on, it is difficult to get it back on.

So go ahead and attach your coil. It should look something like mine below.


With the post style of the Vortex, I like to wrap each leg almost all the way around the entire post, then tighten. If you only wrap it halfway, there is a greater chance if it slipping out when you tighten down the post.

Once both of your legs are wrapped and you have checked to make sure they are secure, you can trim off the excess. Make sure you check to make sure they are both locked in, because once you trim the legs there is no going back.

After your legs are trimmed off, now is the time to check your ohms.

Mine came out to 0.8 ohms with 12 wraps, and after I put the wick on and primed it, it started measuring at 1 ohm. You should be somewhere in that ballpark.

If your ohms check out, now is the time to dry fire it and then compress the coils together carefully if you didn’t already do so before attaching it.

Now you’re ready to add the wick.

Step 2:  Applying the Wick

For this tutorial, we are going to be making a cotton bed for the atomizer to sit in.

You’ll want to tear off about 1/8th of a cotton ball. Carefully thread it under the coil. You want it to be fully touching the bottom of the coil, but there shouldn’t be a ton of pressure.  I also try to make sure that the openings on both sides of the coils aren’t fully obstructed.

Trim off any excess cotton, and you should have an end result that looks something like this:



Once you’re confident that you have everything in place, it’s time to prime the wick. You’re going to want to get it really good and saturated. Since there isn’t any wick covering the top half of the coil, it will dry out and glow orange quickly if it isn’t properly lubricated which will give you a harsh hit.

I usually drop juice all around it, then give it a minute or so to soak in, then repeat.

Once you’re done, you should have something that looks like mine:



At this point, you are ready to vape! Pop on the top cap and let ‘er rip!

Here’s how mine looks in action:

 The Bottom Line

This is a pretty solid build and will work good in a lot of devices. There are a few things worth noting:

  • I drilled the airhole out on my Vortex to 1/16. This is very simple to do and takes 2 seconds if you have a drill and a 1/16 bit. The stock hole is fairly small and won’t give you the same level of vapor production.
  • While this build provides a great deal of vapor, it does tend to mute the flavor of your juice more than a more standard wick-through-the-coil build would. This can be good or bad depending on the type of juice you are vaping.
  • You can apply this build to pretty much any kind of rebuildable atomizer. You can also easily do a multiple coil build with this style of coil.

Have fun!

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