That must be packed in reality Lexel. 12mm is pretty small. Nice work. :+1:
It reminds me of the layout on the Darkside Nymph driver with the 7135 chip soldered in the upright position to save space. But it isn’t exactly the same. Components are different. Yours also has (re)programming pads. Wow! Nice touch! 
:+1:
I did not rationalize any parts away it has full OTSM support and 2 caps
If the 1mm copper area removed its 10mm but then grounding is an issue
Can’t some of the green material near the edge be scratched off and then have a bit of solder between the driver and the body?
Like maybe near that circle at the top of the ‘G’ where there’s some free space
sure this would be possible to get grounding
first prototype just soldered
new 20mm 8A buck driver (old one 6A)
new 33.5mm SD75 drivers DD+small current FET and 8A 2-4S Buck
Nice stuff 
OK… There’s a moose on that buck driver…
Geez, that’s a lot of vias. Are they needed or is that just cosmetic?
I reckon your horsing around Hoop. 
A proud buck, just grazing in the arctic tundra.
I raise you a Trojan horse. 
Pretty fly for a buck driver.
not really needed as we talk about 1-2W heat depending on current and voltageges
but guess adding thermal viases dont hurt, unless you try to solder on them with too small iron
Lexel, sorry to ask, as this may have been answered before!
Do you have 17-19mm drivers with Narsil (side switch) that can be used with 1 or 2 Li-Ion cells, for a single or triple emitter light?
I need something like that to mod the BlitzWolf BW-ET1 (AA/14500 light, side switch) either with a single emitter or triple!
Never modded an e-switch light before nor one to take 2 Li-Ion batteries, hence my doubts. Also…I tried to keep up with the drivers’ list but I’m too dumb to get it right 
I thank in advance for an answer on this
all my drivers can be run 2S
with 7135s I got 17 and 17-19mm with bigger copper rim
17mm I got newer drivers without AMCs that use a small FET instead for more realibility
Thanks for the answer Lexel!
The 17mm with FET is single sided?
I ask because the ideal diameter for the driver would be 18mm, but if it has 2 sides populated the battery tube won’t be able to make contact with the head and the driver, what will imply modding more things!
If the FET driver is single sided I can manage to make it work in some way !!
I never saw any problems with double sided drivers,
the parts simply are smaller than the spring and dont cover the tube rim
they are designed to fit battery tube lights
17-19mm
Yup, normally they don’t have issues, I’ve used them on other lights and they fit
But the “anatomy” of this light makes them harder to fit while screwing the tube. This is the original driver and the battery tube (more driver details here) :
As you see, the “bottom” of the driver is “clean”, so the tube makes contact with it and screws in completely.
Using a double sided driver (17mm, from you) you can see the gap it generates.
I explained myself wrongly, as the driver fits the hole, but the 7135 chips hinder the screwing in! Hence my question about being single or double sided!
I guess if it is double sided, it won’t fit 
there is a simple solution, called belt or wheel sander
simply shorten the tube a bit
the gap does not affect water tightness or so its a minorcosmetic thing, the light could have need that way originally
I am no expert rewriting the 2 Channel firmware to match 3 channel pinout its simply not the same channels on same pins
on older 30mm I had made pads to solder to reroute the pinout as I failed trying to program it
also that driver has a 2. board vertically attached to it likely for switch, not easy to handle