Some thoughts on the Serpent SMM

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suprtrkr

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(Disclosure: The good folks at Elegomall sent me this for a test drive and a write-up. FWIW, you are getting my unvarnished appraisal.)

I recently acquired a Serpent SMM tank. I was prepared not to like it as it does not appear to be intended for my normal style of vape. It's a single coil design, where I am a dyed-in-the-wool dualie man. I generally prefer large capacity tanks when I choose a tank over an RDA or RDTA; this is 4ml. More fool me, actually: the topper is a collaboration between Wotofo and Suck My Mod, both of whom are famous for quality gear. This tank is no exception. (Plus my apologies for the sometimes-blurry photos accompanying. Apparently I have not yet mastered the macro mode on my new camera and, of course, your humble correspondent (the idiot) didn't notice this until after the tank was built and filled.)

For those who don't want to read all this, my conclusions first. I like it. A lot. It is not, IMHO, a full-blown cloud machine. Full open, I would estimate it breathes about as well as a Boreas RTA or a V4 Velocity RDA with the air closed half way. That's not to say it won't handle power. I've had it to 125 watts for as long as my lungs would stand it (I'm a 40 watt vaper) and could not dry hit it. It is very flavorful, something I should have expected given Wotofo's Sapor is my go-to RDA for flavor. It has a very nice airflow design and should be near impossible to make it leak. So far, I haven't gotten a single drop out of mine, even the time I forgot to close the air and invert when filling. The air also closes down nicely, and it should be a very good big flavor MTL tank as well, albeit I have not yet built it so. If you like the idea of a big-flavor tank up in the 10 to (at least) 100 watt range, you want one of these. If you are a fancy-wire, big single coil type, you need one of these. I have seen it online in the sub-$40 range, and I think it worth the money.

The tank is a fairly conventional air-over-vacuum, bottom coil design, not counting the airflow system. It measures 24mm in diameter by 31mm tall. It is top fill, and the manufacturer recommends closing off the air and inverting when filling to prevent leakage. The build deck is spacious and easy to use, but it is designed as a single coil machine. It would be possible to squeeze dualies in there, I think, but it wouldn't be easy and they'd have to be small internal diameter. Hhhmmm... perhaps a vertical double barrel shotgun set... Aaahhh... another project.

Photo1.jpg

In the box you will find the tank itself, not one but two spare glasses (kudos!), a Little Blue Screwdriver (actually, mine is black and of conspicuously better quality than the standard, another Wotofo tradition), O's and screws, three coils of different but untested values and sizes all wrapped in Alien wire, a strip of cotton (I'd actually guess rayon, it looks like a piece cut off a rope), a manual and a contest entry form for a Wotofo T-shirt. I found myself particularly amused by the “contains nicotine” warning prominent on the front since, obviously, a new atty has nothing in it but air and maybe some machine oil residue.

And here is the little darling assembled. Barely visible in the photo is the engraving on the barrel, reading “Serpent SMM” on one side and with the slanted SMM logo on the other:

Photo2.jpg


The pieces of the tank, clockwise from upper left, drip tip, top cap, barrel and tank glass assembly and base with deck:

Photo3.jpg


The airflow is interesting: the air inlets are in the inward facing sides of the towers, making it just about perfect for a single coil set between them, see arrow in the below photo. It also means you'll have to just about have to fill up the vape chamber inside the barrel to make it leak. That's a super-neat design element.

Photo4.jpg


The towers each have a generous wire slot cut on both sides, measuring 1.7mm tall. If that means nothing to you, trust me when I tell you you can put some big wire in there. No need to thread the ends of the wires through holes; they lay in neatly from the sides, meaning you can leave the tails long and clip them later, making the deck much easier than normal to build. The fact there are four slots also means you can wind your coil clockwise or counter clockwise, plus install either type legs down or up, just by choosing the set of slots appropriate for the task.

Photo5.jpg


I then got down to building it. I happened to have some ROFVapes alien wire in Kanthal A1 laying around (.3 x .8 ribbon Claptoned with 32ga round) which I hadn't used in forever plus three days, having been converted to Stainless back along. So I whipped it out and wrapped a 5 full turn spaced coil on a 3.5mm mandrel, which is the largest I had handy. The coil calculated to .475 in Steam Engine, measured .482 and the mod thinks it is a .44 ohm coil. The literature says it will take a 4mm diameter coil, and it might, see the following two photos:

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I popped it atop the Predator, set for 50 watts, and got a burn slightly cooler than a furnace:

Photo8.jpg


Wicking the machine is child's play. Pull the cotton (rayon!) through the coil and trim the mustaches slightly wider than the base:

Photo9a.jpg


Then stuff the tails down in the deck holes using any convenient implement:

Photo9b.jpg


(Out of photo space, continued)
 

suprtrkr

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Here is a tail lifted to show the hole in the deck:

Photo9c.jpg


There appears to be no shortage of vapor in the test burn:

Photo10.jpg


And the whole assembly, ready to vape, on the Predator:

Photo11.jpg


Finally, for comparison, here's the current desktop set (excluding mechanical mods). L to R, the Serpent SMM on the Predator, an iJoy Limitless on an RX200, another Limitless on a Vapor Flask Stout and a Boreas on another RX. The Serpent is small, but she's pretty powerful:

Photo12.jpg


To conclude, I really do like the machine a lot. I normally vape in the .5 ohm/40 watt range, and it's very flavorful there, not to mention plenty cloudy for me. I have run it up to 125 watts, but the flavor still made my eyes water (and the vape seared my throat and made me cough up a lung, since I'm not used to it). I am going to rebuild it as soon as it wants a new wick. I am presently thinking of a triple-twist 26ga SS316 coil, which will let me get a lower ohm rating in the same space, plus bring the “crispness” of Stainless to the flavor profile. I also want to try a 1.0 or 1.2 ohm single with the air closed down for MTL. I think it will be superior-- maybe wonderful-- in that regime. Will post when I get the coils built and installed.
 

suprtrkr

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Ah, and another thing I forgot to mention. Being a Crusty Olde Pharte™ with arthritic old fingers, I have found it more convenient to remove the tank from the mod to close the air ring before opening the top cap to refill. The air ring is the lowest ring on the assembly, and it hurts my hands to try to rotate it up against the top of the mod since the Predator is about 30mm wide and bigger than the tank diameter. This is more mod choice than a deal breaker. When I put it on the Vapor Flask Stout, which is narrower than a 24mm atty at the 510 end, I have no trouble closing it. And a younger person with more dexterous fingers will likely not even notice, no matter what mod it may be on. Finally, I am by no means certain it is actually necessary to close the air anyway. I have never done it on purpose, but it didn't leak the time I forgot and took the cap off with the air open.
 

suprtrkr

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Time for a rebuild!

After a week-- 30-40 ml of juice-- the flavor started getting a little off. I figured it wanted a new wick and, as promised above, it gets a rebuild in SS316 instead. I have had similar problems with Alien wires before. They're great at what they do: the ratio of surface area:volume is enormous, therefore they heat fast and evenly, with tons of wick/wire contact for great vapor. The drawback is, that gigantic thermal mass of wire doesn't cool down any too quickly. When you release the button, the wires is still at or near vapor temp and the cooling effect of the draw is ended. So the wick lays in the coil and cooks itself. Rayon, which I use exclusively, is more resistant to heat damage than natural cotton in my experience, but it is not immune.

Opening the machine, I found the wire was beginning to gunk and the wick, while the tails are bright and clean, is discoloring in the coil contact area:

Photo 1.jpg


Removing the coil from the deck, the damage is worse than it appears. The wick is burnt clean in two within the coil body. It was still wicking well enough to avoid dry hits, but the flavor was off and getting worse:


Photo 2.jpg


Photo 3.jpg


So we shall repair the damage. The Alien tractor tread will be replaced with a 2 x 28ga SS316 twist. Twist pitch 1.2mm, 4 full turns, 3.5mm mandrel (I've got to go buy a 4mm drill bit or something) for .37 ohms.

Photo 4.jpg


Photo 5.jpg


Et voila, the magic has returned. The flavor is clean and bright-- I'm testing this with my old standby desktop clove juice as it is very clean and will show any odd hints of flavor in even tiny amounts-- and the coil is just about as cloudy at the watts I vape. Being a modwomper personally, I really can't get the heat on a coil my steamthrower brethren use and so Alien wire is probably wasted on me anyway.

I was sold on SS wire some time back. I think it tastes cleaner than any other available wire. I notice a (admittedly small) difference in the flavor-- more “crisp” is the best I can do to describe it-- already, just from not using KA1 wire any more. I feel similarly about rayon wicking verses natural cotton. I just like the flavor better.

But no matter how you build it, this little tank is a flavor pumper and that's a fact.

One other point I want to bring out is the glass will lie to you. There's 4-5mm of space under the build deck acting as a juice tank, so the tank isn't empty just because the level is at the bottom of the glass. You have to tilt it to see how much juice is left.
 

Steamer861

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I like mine :) Few things, it's way too small! IMO it's designed for a big Clapton Coil, but don't have the capacity. With the Big coil a full tank would last me about an hour :(
It is well made, it wicks fine, don't leak or flood when filling, flavour is satisfactory.
I ended up putting a plain round wire coil in mine & put it on my VT75 Nano, it looks good on there :)
Even with the simple round wire coil, it still needs refilling often! to often :(
 
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