Thank you
30$ for custom (almost one-off) and so powerful driver looks OK to me
You won't be seeing any similar soon... If it's easy for everyone to build one it would be done already
I’m in for one please if this is still open and happening
Guess I would need the fet switch too, doubt I can make one 
There is a difference between 1) the production costs, 2) the value of this driver: how unique is it compared to what is around, and 3) what I’m prepared to pay for it.
1) I do not know but you will find out, 2) I think as a custom driver that has unique performance it may be worth over 20 dollar, but 3) for my flashlight builds that is too much, I would pay between 10 and 15 dollar most.
So if under 15 dollar, I would like one 
Interested in at least 2 of each and fet tail boards, 4 or more of them
How much would you want to pay for a FET/tail board?
One unit requires 2 seperate boards, and that means 2 seperate sets of assembly setup costs.
For these boards, Ive been putting together the price of the components and its going to be at least $10 worth of parts per board.
Might be able to get the price down from the manufacturer in China, but we are easily looking at the best part of $20 per set of boards at a guess.
It would be much cheaper to just supply the boards for each person to assemble, its not that difficult to solder the SMD parts, just need patience and use tweezers and a fine tipped soldering iron.
If it's easier to assemble FET switch than driver then i could use 2 as well...
I have both of those items, and experience, and I am willing to give it a try. Age however has taken a toll on my eye sight and the steadiness of my hands so I lack a bit of confidence when SMD’s get too small
I’m gonna have to learn to do it sometime so I would go for parts.
Yup, its much easier to assemble this than the driver board.
If the soldering on the driver was that easy for the driver, I would do it myself too, the hardest parts to solder is the microcontroller and the temperature sensor IIRC.
I can probably get the costs for a pair of boards down to around $5 I think.
Will confirm later.
I guess that’s going to be too rich for my blood I think. Not to mention that I completely forgot the fact that tailcap mod is required.
I have one that’s been used here and there for months using the factory omten switch in a convoy S2+. I did however add a wire bypass to the switch.
The omten switches are cheap if one fails. This driver has a soft start function that seems to contribute to the switch surviving where it shouldn’t. This driver pushes the switch to it’s limit and beyond so your mileage may vary on how long it will last. Also the GFS16 Fet switch board is all that’s needed to turn the switch into a high current one. The add-on led board just adds some battery level indicator function to the switch.
What is a safe and reliable option for the tail switch?
I fixed the miss spelling of the GFS16 fet switch. 
The reliable is the GFS16 Fet switch. That was the reason Loneoceans created it. From his writings, I think he said he had omten switches that melted. I haven’t experienced that yet in the bypassed switch on mine. I have both switches in two different S2+ lights using this driver and both are working fine but the omten switch in heavy use would probably not last long. I’m just stating that one can use the factory omten switch if bypassed and not used frequently. The way to go is difinitely the GFS16 Fet switch for reliability and heavy use.
Well It would not surprise me being a cheap chinese switch and is being pushed over its limits probably anyway with 6A or more of current going through it.
The main benefit of the switch though is the much lower voltage drop and/or resistance that is experienced.
Thats why its important to construct the unit well and solder braid onto the springs, etc.
I think 30 USD (~44 AUD) is too much for me since I don’t really have a plan for the driver. It doesn’t seem unreasonable for a small run of a unique product, I just can’t justify it for myself.
What kind of quantity is required to bring the unit cost down?
Depending on the final price, I would be interested in two pieces.
With 30 USD driver cost I may buy only one, with 20 USD two 17mm.
It maybe cheap but its quite robust. Alot of modders here have pushed them quite hard and they just keep on working. Nothing like this driver does though, upwards of 15 amps across the switch.
I built a few of the GFS16’s with blue spring’s and modded them to fit in a V11R just for the lower v drop. It’s a very nice low resistance designed switch that can give you a little more output to the led.
Yeah, quite true, I think the switch would be fine in most applications.
Ive just got a quote on the boards for the tailcaps, and they come just under $1 each, so you are looking at $2 for a pair of boards for a tailcap switch.