First pic shows the supplies I use to make my DIY batches by volume, using my own method:
1) Syringes shown cost me $.20-.35 each, and each 1 lasts about a year, or longer. They last because you don't even use the plunger that comes with them. So there's nothing to wear out or become brittle. You don't even really need all those sizes though. I just prefer them. I usually only use 2 of them, when making DIY, depending on what amounts of flavorings I'll be measuring.
2) The syringe tip covers (along the bottom of the pic), cost $.05-.25 each, depending on which type someone prefers. Again, each 1 lasts a year or more. I've been using the ones shown for almost 2 years already.
3) The bottles, that I use
for my "marked mix bottles"...were bought in very large quantity from a US plastics manufacturer, because I share them with many other people, too. They cost me $.10 each for the 125mL ones and $.12 each for the 30mL ones,
including shipping them to me. I handwash them, and they're reusable over and over again. However,
any plastic or glass bottle can be marked (explained further down) and used as a "mix bottle". New, specific bottles don't have to be purchased.
Bottles #1 and #2 are used to make my own DIY, at a finished PG/VG ratio of 40/60. So, bottle #1 is marked on the front, for a 100mL batch at 40/60, and on the backside for making a 50mL batch at 40/60. Bottle #2 is marked on the front, for a 30mL batch at 40/60, and on the backside for a 15mL batch at 40/60.
The syringes will have the plunger removed (shown in the pic below), tip cap put on the tip, and will be used simply as miniature graduated cylinders. The flavorings and nic base will be just dripped/squirted/poured into the syringes to the specific amount needed...one at a time...and then poured into the mix bottle. Any plain PG and plain VG in the recipe
won't have to be measured with a syringe
at all though! Each will be just squirted or poured into the mix bottle.
Oops! I just noticed I forgot that on Bottle #1 in the pic...that is a bottle marked on that side for doing DIY for a friend at
her ratio...not my 50mL 40/60 batch markings.
Here's how I make any size batch of
my own DIY at a finished ratio of 40PG/60VG, once I've chosen the mix bottle to use for the amount I want to make (15mL, 30mL, 50mL, or 100mL):
1.) I drip/squirt/pour each flavoring (in a PG base), 1 at a time, into 1 of the syringes to the amount specified in the recipe, and then pour it into the mix bottle.
2.) Because my nic base is in a VG base...I don't add it to the bottle
yet. (If it
were in a PG base, I would though.)
3.) I squirt or pour plain PG into the mix bottle up to the line at the 40 mark.
4.) I drip/squirt/pour my nic base in VG into a syringe to measure the appropriate amount, and then add it to the mix bottle.
5.) Last, I squirt or pour plain VG up to the line at the 60 mark.
That's it....cap the bottle and give it a good shake.
Bottle #3 is the 1 I use when I make 100mL or 50mL of DIY for a friend who vapes
eliquid at a finished ratio of 70PG/30VG. That's why the bottles I use to make hers are marked specifically for the 70/30. I follow the same 5 steps above to make hers. I also have a smaller bottle marked for her ratio also, to use when making her a 30mL or 15mL batch.
It doesn't matter
what PG/VG ratio anyone wants their DIY to be, because it's easy to figure out where the markings should be, and then mark the "mix bottles" accordingly. When I've helped someone learn how to mix by volume this way...I usually just go ahead and mark a few bottles for them, once I know their finished ratio.
It's really an easy-peasy way to mix, is
very inexpensive as far as supplies needed, and the minimal clean-up when finished is a breeze.
A hint though - To make the markings on the bottles last a long time...cover the marking area with a piece of clear packing tape.
ETA: If anyone is genuinely interested in trying my method, please PM me. I can point you in the right directions for the supplies I've used to do it, at the lowest possible cost.