BSD's vertical hollow core Micro Coil build for ARO, Evod, and Protank heads.

[Big Screen D]

In general it will last till your coil gets caked up. Depending on type of wick, type of juice, how hot you run it, and how much you vape a day. I average ~20mls or 4-5 days for me with a cotton core. All you do is pull the wick with needle and tweezers dry burn and rewick. Its worth it for quality of vape you'll get. - your worst enemy is running it dry.

Yep, caked up coil is almost always the reason for a trip to the clean up station.

Lately, I've warmed up to the slightly larger 28ga 1/16" coils vs the 30ga on 18ga needle coils for this very reason. Particularly for my Boba's Bounty tank. What happens first with that known coil killer juice with the smaller ID coil is as the coil opening closes, and the draw becomes tighter, it throws the balance off and I start to get flooding.

The first one I made is now nearly a month old, and has been re-wicked three times having gone through a 50ml bottle of HHV Ga Peach Tobacco. After a dry burn, and ultra sonic bath, the Nichrome coils looks brand spanking new.

 

[JeremyR]

It seems like the thing that cakes the coil faster is when it gets too hot and goes from vaporizing to cooking.

Yeah a nano just fills with juice. I had been running a 1/16 micr, but right now rocking a 3/64 which loosened up the draw for me. I like really loose draw. More air is more vapor usually. I wonder if more air will help keep the coil from going over temp and give me longer intervals between cleaning.

 

[Big Screen D]

I really need to try a 3/64th ID. Falls between the 18ga needle I use for most builds, and the substantially larger 1/16", so I suspect that 3/64" is a good compromise. Odd though that the draw loosened up with the smaller 3/64" ID.

I think what happens also with my 100% VG Boba's with the smaller coil is like you said, the surface tension tends to fill the coil much like my other juices would do in coils smaller than 18ga. So pretty much 18ga (1mm) is about the smallest ID that is workable.

 

[JeremyR]

Oh sorry I meant 3/32 or 5/64 right in there..! Next size up or so from 1/16". Wrapped around a mini screwdriver

 

[mekc57]

I'm having a couple of big problems with these coils!

First, I'm vaping at least twice as much as I was before using them because my juice taste so much better!

The second, I used to use one 18590 a day and now I'm cooking though at least 2 sometimes 3 18650s because my 1.5 ohm coils work best at 4.3 volts. I know that's like red zone cooking but that's where I get my best vape without burning. I started in the low 3 volt range and it was ok. Decided to push them a little and settled at 4.3. 4.4 starts to burn a little.

I'm impressed !!!!

 

[kgs-wy]

Just to reinforce JeremR and BSD's comments about the coils, so long as you don't overdo your voltage/power settings, these things last, relatively speaking, forever. The build I did at the top of the last page (the alternative hemp pack tutorial) has been going strong ever since, no significant lessening of vapor, throat hit or flavor (we're talking sub-5%, and that goes back to essentially full if I let it sit and soak for a few minutes)...

For information and comparison purposes, I vape on average 6 ml of 70/30 VG/PG liquid through that particular head each day I vape it, set at 4.5V, and I've vaped about 26ml through it since last Monday. The cotton didn't last as long for me, so I've gone full hemp twine, at least for now. In my other hemp builds, for all intents and purposes identical to the tutorial build -- but using a liquid with higher PG in the PG/VG ratio -- needed cleaning earlier. The 65/35 PG/VG liquid I like, and that I vape at 4.1V - 4.2V, I had to rewick the day before yesterday after about 16ml. The 50/50, which I vape at 4.2V - 4.3V, I'm probably going to rewick tomorrow, after about 18ml.

As to the drill bit size, I do prefer a looser draw than the stock ProTank 2, and just a tiny touch looser on the PT v1, which the 1/16" drill bit gives me. I might step up to 5/64" on the PT2, not sure yet. Possibly will when I rewick my 50/50 for my PT1, but that will leave a tad less room for wick packing in the PT's coil base. How was it for you, comparing the 1/16" to the 5/64", as far as packing, Jeremy?

At any rate, keep on vaping, everyone!

-Laters...!
kgs-wy

 

[kgs-wy]

I'm having a couple of big problems with these coils!

First, I'm vaping at least twice as much as I was before using them because my juice taste so much better!

Biggest problem I've had with these coils to date, aside from getting the wick pack just right...

The second, I used to use one 18590 a day and now I'm cooking though at least 2 sometimes 3 18650s because my 1.5 ohm coils work best at 4.3 volts. I know that's like red zone cooking but that's where I get my best vape without burning. I started in the low 3 volt range and it was ok. Decided to push them a little and settled at 4.3. 4.4 starts to burn a little.

What gauge of wire are you using for your builds? I have gone from 30 ga Kanthal to 28 ga Kanthal 'cause it seems to be a bit more efficient with the use of power (more vapor production and slightly cleaner taste per watt). Also, due to the nature of this build, I've noticed I can use more power, and thus get even more vapor production and slightly better throat hit (which has actually lessened my e-liquid usage over time) than with standard coils.

As an aside, has anyone else noticed such a happening, or am I the crazy one here?

I'm impressed !!!!

They are awesome, aren't they?

Keep on vaping, everyone!

-Laters...!
kgs-wy

 

[mekc57]

I have some hemp twine. I'll have to give it a try.
Do you boil it first or just use as is? If it taste like it smells I think it could use some boiling personally.

My mistake. What I have is jute. I'll have to look for some hemp!

 

[Big Screen D]

I find the sweet spot for coils on VV devices to be 1.8-2 ohms. Best balance of battery life and range for most VV devices.

 

[mekc57]

kegs, I'm using 28g on a 18g syringe needle, about 14 wraps. I tried to up the ohms by using an Alan wrench that's about 1/6 and it was smoking the rubber gromit a bit so it pulled it apart and went back to the old method. I'm going to pick up a new 1/6 drill bit soon and try again. I guess I broke my old one drilling something a little to hard or something because it is missing from my tool box.

And yeah, they sure beat the stock setup. I have also tried horizontal micros and these beat them hands down too!

 

[mekc57]

I can't seem to get above 1.6 so far. My first was 1.3 ohms then 1.6 and the one I made today is 1.5. I need another wrap or a bigger mandrel to wrap on I guess.

 

[Jayvon633]

so ive tried this build a few times, im not the best at rebuilding but im alright at standard micros on the t3s, snd iv had no luck trying with silica. with a 1/16" bit about how many wraps should i use with 28g wire? i thought more was better for this build but i want to get around 2 ohms. when iv built so far i always get a burning taste with no flavor even if the coil burns nicely.

 

[Big Screen D]

I haven't attempted silica. No flavor, and burning sounds like it's not wicking well for some reason.

13/14 wrap gets me right at 2ohms with 28ga Kanthal at 1/16"ID. Generally I run these around 5v. I also snip the end of the grommet off since that coil winds up really close to the grommet.

 

[JeremyR]

but that will leave a tad less room for wick packing in the PT's coil base. How was it for you, comparing the 1/16" to the 5/64", as far as packing, Jeremy?

Well I have a protank but its on a shelf, I use an oddy but its similar. I actually don't pack at all. If you look a my Vcore thread that's all it takes for me. Don't have to worry about packing. Although I'm starting to toy with it a bit. Well I would say packing is not the right term because it implies tightly packed or pressed in. I leave my cotton/ rayon airy & light. I don't even have the diameter of my cup full. The oddy cup is only slightly larger than the protank. The protank has a looser draw than the oddy. I have noticed on occasion that I used more juice than normal and sometimes less, I think the less is from the strong nic hit and having to put it down.

Yeah mek if your out of depth go wider. Each step up in coil size is like 1-2 more wraps in res. increase.

I'm going to set up my protank soon for back up. I do Plan on getting the negative grounded at the top, In the wick channel, we'll see.

 

[kgs-wy]

I do Plan on getting the negative grounded at the top, In the wick channel, we'll see.

Good luck, dude! I didn't have much luck, but then, I'm still fairly new to rebuilding. If ya get a chance, try and take some pics to help some of us less experienced at it!

As to the 18 ga syringe vs. the 1/16" drill bit, Jeremy hit it right on the head. The larger your basic coil inner diameter, the more wire you're using per coil wrap, and thus, the higher the resistance.

When it comes to makin' the coils, just keep at it, guys! You'll only get better with experience, after all!

That said, keep on vaping, everyone!

-Laters...!
kgs-wy

 

[Jayvon633]

I haven't attempted silica. No flavor, and burning sounds like it's not wicking well for some reason.

13/14 wrap gets me right at 2ohms with 28ga Kanthal at 1/16"ID. Generally I run these around 5v. I also snip the end of the grommet off since that coil winds up really close to the grommet.

ok il try that. i also replaced the grommet with the aga piece i think its silica and is higher heat resistant.

 

[JeremyR]

I did get it grounded out the top, I've got pics to post later. I would like to get a good test run with it. This cup is a lot smaller than the oddy when your working on it. Right now I've got A lot of gurgling, will have to mess with it later. Maybe I will have to pack it in more for the protank.

 

[mekc57]

I finally got to Lowes and picked up a couple of drill bits 1/16 and 3/32. I tried the 3/32 first twice and they were burning the rubber both times even with the grommet cut. I think there just to big in diameter but the 1/16 worked great! I didn't think the small amount of size difference over the 18g needle would really mater but to my surprise it dose! I also got my organic cotton balls boiled and dried out. They gave my a fluffier pack than the q tips I was using before too. I did two coils. He first came out to 1.8ohms and the second is 2.0 on the nose. The draw is much better so far too!

Vapping clouds at 5 volts!!!

 

[Ta2ooz]

I finally got to Lowes and picked up a couple of drill bits 1/16 and 3/32. I tried the 3/32 first twice and they were burning the rubber both times even with the grommet cut. I think there just to big in diameter but the 1/16 worked great! I didn't think the small amount of size difference over the 18g needle would really mater but to my surprise it dose! I also got my organic cotton balls boiled and dried out. They gave my a fluffier pack than the q tips I was using before too. I did two coils. He first came out to 1.8ohms and the second is 2.0 on the nose. The draw is much better so far too!

Vapping clouds at 5 volts!!!

I'm with the other guy, I'm using 28ga and a 1/16 th bit and I have been wrapping 14 comes out to 1.7 ohm. This is fine for me but I am using a 134 and a vamo and both have to be upwards of 10 watts. Also fine other than battery life. I tried the last one at 16 wraps, bit tight to cram in an evod but it fit. I am not complaining because after the coil heats up and it gets vaping the flavour and production is awesome. These are just what is going on here, on another note which end is everyone using as the gnd? I am using the long one from the top.

 

[JeremyR]

Most definately the one from top. It Has the highest chance of grounding out by accident. You made the right choice.

Yeah these need a lot of power. 15w on my oddy build.