I got some of that "wax liquidizer". It uses PEG400 which has a bit of controversy surrounding it because apparently it turns into formaldehyde at high temperatures.
Tried mixing it with some rosin that a friend had pressed (and judging by the link you sent, he has exactly the same press) and... I don't feel like it worked at all. It tastes bad, the mix is all gloopy and waxy. I don't know if you're meant to do some decarbing before mixing or if the rosin is supposed to be further refined since it will still contain plant matter which would explain the waxiness.
Also tried mixing it with the budder that I got from 420M. Also just didn't really feel like it was working and didn't like the flavour (or the thought that I might be inhaling formaldehyde).
Ja, I don't know. I really wasn't pleased with the result and have basically decided that I'm just going to keep using HV but with better self-discipline so that it lasts me a bit longer. I don't know how vape cart makers like HV do it - they're clearly mixing things up with terpenes instead of PEG400 weirdness, but I don't know how they get their starting thc material to be so clean compared to the rosin.
If you figure it out, let us know (or start selling to us

). My half-assed experimentation came to the conclusion that it's not worth it, but I am on the lazier side.
Edit: Also they may claim those empty carts are "CCell", but they don't have any of the hallmarks of a geniune CCell cartridge. They do work, but who knows how they measure in terms of lead content and whatnot.