Tobeco Big Dripper from Canvape
The Tobeco Big Dripper is an unusual atomizer. It is a dripping atomizer, but with a twist. The top part can hold up to roughly 3 ml of vapor liquid. It's not really a tank since the liquid is only suspended in place by internal vacuum. To release liquid to the coil and wicking material, you press the top part that holds in the drip tip. That compresses the contents of the tanks and squeezes out some liquid through a small hole at the bottom of the "tank" and into the wicking material.
You also have the option of removing the top part and filling the liquid from a container ... dripping it in like a regular dripping atomizer. The picture at the top left is the Big Dripper beside the box. It's minimalistic packaging, a small box that holds the unit, wicking material, a small portion of coil wire, seven spare screws (two for the negative terminals, three as post replacements, and unclear what the other two are for), five spare seals, a mini philips head screwdriver and an allen wrench. Yup, an allen wrench. The post screws are allen head and the included allen wrench is not quite the right size. The picture at the top right is the Big Dripper unit itself showing the top tank part and the base. The base is really deep, but that is somewhat deceptive. It almost looks like it would hold over one ml by itself. If you look closely, though, you will notice that the air holes are at the top and limit the amount of juice the well can hold by a good amount – it's still quite a deep and generous tank well.
The picture at the right shows two separate views of the tank. The three pieces on the left show the unit disassembled. The left part is the tank itself. The base is quite visible and beside that is the housing that covers the base and inserts into the top tank cover. It's spring loaded. The drip tip holder in the tank has an O ring on its outer edge and an O ring on its inner edge to hold pressure that retains the liquid in place and squirts it out when the top is pressed against the spring. The two parts at the right show the tank and spring section assembled ... you can see at the bottom the small hole that the liquid is forced through. One thing that is NOT obvious and I will point it out is that the base has no "ridge" that prevents the top tank part from going past its edge. That means that the posts inside can come into contact with the bottom of the tank and short out. This is one flaw in the design of this tank and something that you will have to watch closely.
At the left is a picture of the bottom of the tank. The 510 connector is fixed and not adjustable. The two screws (spares are included) are for the negative posts. This is the first time I have seen removable posts held in place by screws.
You can also see the bottom of the tank has no ridge to prevent the tank from going to far past the bottom edge. If you look at the top right picture, there really isn't much room for the deck and posts ... the tank does not have to go past the bottom edge by too much before the posts short out.
In most of the pictures, you can also see the air flow ovals. There are two of them, one on each side of the tank. The air flow is not that generous. You can lung hit with this, but it's a toe-nail curler. To make matters worse, unless the edge of the tank is perfectly aligned with the edge of the bottom of the base, and the air flow holes on the inner base align perfectly with the air flow holes on the tank, you also get some restrictions in air flow. It's the up/down alignment that is the bigger issue with this tank.
The posts holes are adequate and you can get a pair of 26 guage twisted coils into the center power post. The challenge is that the post holes are slightly below the edge of the base.You will need to put a slight upwards curl into the coil legs to get them in properly. The negative holes relative to the positive hole are slightly offset too – just a tad lower. That's actually welcomed since the coils legs are also offset by about the same amount of space – it helps keep the coil body on an even level.
I built two 1.8 ohm coils for the Tobeco Big Dripper. You can see those at the left after I've pulse fired the coils to clean them up. The builds were perfect and only one slight adjustment had them firing from the center and glowing perfectly.
At the right, is the coils showing that really nice glow after I had finished the minor adjustments. The final resistance was 0.9 ohms.
You can click on both pictures to see larger views – however, note that the picture at the right is slightly out of focus ... I couldn't seem to get the camera to focus properly while the coils were glowing.
Wicking was with some rayon wicking material that I had left over (thanks to The Village Vaporette). I used a fair amount of wicking to get the bottom of the tank. Even with all the wicking material, I am fairly certain this held about 30-35 drops of liquid in the base with no overflow through the air flow holes.
The build itself was fairly easy. What was more difficult was filling the top part of the tank. The problem is that the top of the air flow chimney that holds the spring is not slanted at the top – you have to fight off the tension of the spring and line up the air flow chimney with the drip tip hole perfectly. It's a big of a challenge. For testing purposes, I only put in about 2 ml of juice in the tank.
Despite its generosity with spare parts and other included items in the box, Tobeco does not include a drip tip with the Big Dripper. I used a wire bore drip tip, similar in size and height to the Subtank. It complemented the Big Dripper quite nicely.
I really wanted to test the liquid release from the vacuum in the tank ... but gheez, I had to vape about 6 times as long with this tank (compared to other dripping atomizers) before it needed liquid added. To this point, vaping on the Big Dripper was a pleasant experience. Very good flavor, nice cloud generator.
However, this is where the flaw in the ointment became apparent. When I pressed the top drip tip to get some liquid out of the tank and into the wicking well, it also pushed the tank down far enough to short out the top of the tank with the coil posts. It wouldn't fire while shorted, so when I tried to remove the tank, it actually un-coiled one of the coils. To use this effectively, you would have to hold the tank while pressing the top to release liquid and check that the tank edge did not go past the bottom of the base. The better solution would be for Tobeco to add a ridge to the base to prevent this.
So, what's the verdict? Is it worth it? The Tobeco Big Dripper is made of really good quality materials and is machined superbly. All the threads are very smooth and thread on and off easily. The liquid well area is likely the deepest of any dripping atomizer and holds more liquid that any other dripper I've seen, used or heard of. It's the only dripper I know of that has the ability to hold a reserve of vapor liquid in a tank like system. There is a glitch in the design that can push the top of the tank onto the posts – and because of that, I reserve judgement about this. If you can monitor the bottom edge of the tank relative to the base bottom, it's worth it. And, if you are enterprising and can slip a spacer between the bottom of the base to act as a ridge, you've got a real value here. The price is incredibly attractive.