the battery, pump vape and circuit boards i put in mine just BARELY all fit, and only with fairly extreme modification to the trap itself via a dremel and lots of plastic removed.
its not enough to have a good, low profile vape in there, it needs to have a decent sized tank too so you dont have to refill it often, and it needs to have a simple switch instead of the ones with complicated control panels so you can solder wires on and trigger it remotely.
i ended up using the Teslacigs Stealth. its a 100w vape with a simple push button. i got the Tobecco super mini tank. which is low profile and doesnt sit up much higher than the top of the vape.
this is a $30 sub ohm entry level "cloudchasing" vape that can actually make really decent smoke. i'm actually disappointed with my trap because i was making a LOT more smoke before i changed the intake tube diameter and added an exhaust tube.
The vape itself has a .75"x .5" circuit board on it with a soldered on micro momentary switch that controls it. i broke my first vape trying to solder off this tiny switch. it is so freaking small.
then i had to solder on a wire to the contact pad the switch used to bridge. this contact pad was about the size of a top of a pin and it was really tough to get a good connection. i soldered the ground directly onto the USB charge port because i knew it was a good ground and it was a snap to solder to. after that, i epoxied a big glob onto my positive wire so it will never come off, then glued down the wire to the vape itself to act as stress relief even further.
The vape itself though is only half of the solution. the vape needs air movement in order to work, so the pump you get needs to move about as much air as human lungs do in a deep breath, taken over about 7 or 8 seconds. i wouldnt want to run the ecig much longer than that in fear of burning it out.
my water pump claims its 1000 liters per hour i think thats about point 6 CFM. needless to say youre going to need 12v 1A to run that pump. it does a great job if you dont restrict it like i did for the sake of space.
I was an idiot and didnt measure ANYTHING when i was picking out internals, but the stars aligned and i was able to get everything to fit, but it took a week to find the right way and order to put in all the components. they are NOT coming back out haha.
the relay i used is as 2 channel remote relay from ebay. super cheap. AND it runs on 12v so you dont need a regulator.
https://www.ebay.com/itm/DC-12V-2-Chann ... Sw4kVZuI~8
this is a great relay and im going to buy more of them for all kinds of projects. cant beat the price either!
i set the relay up as momentary, not latching, each channel controls one device. i did it this way so i can get the pump running first, then the ecig, then turn off the ecig, and finally turn off the pump. this replicates how you would use the ecig IRL and keeps the wick from burning out a little longer.
i also like that since its not latching, i cant trigger it accidentally and just have it running when i dont know.