I posted this over on fuckcumbustion yesterday. I make mine with shatter and Wax Liquidizer. I also add a TINY amount of terps. I love it, it's discreet, easy, and potent. My problem is finding pens that don't leak all over.
I make the shatter first (Everclear) and then place 1 gram into a large sized dram with 2 mils of Wax Liquidizer and a 1/2 a drop of lemon terp. I make sure the cap is nice and tight and then I fill a coffee cup with a little water, enough to submerge the dram up to the liquid. I place it in the microwave for 30 seconds at a time, until the shatter has mixed completely with the Liquidizer.
So, I got a Rubi pen in the mail just now and it's charging. I have the tank filled and everything looks good. I did have someone tell me this about the Rubi, however:
"I have not had my Rubi leak but in all honesty it sucks with what you are making for it. I actually have the same mix and just don't get great hits out of it. My 1st tank made gurgling noises every hit , my second tank I made just never put out good vapor. I think the carts are not designed for our thc ejuice as i have read around the web and many had the same issue. I'm wishing you luck though , maybe they re-did the tanks , mine are from when it 1st came out. Please post some results ."
I am hoping that it may have something to do with the quality of the concentrate. I have had some that was really cloudy with shit floating in it. This shatter came out very pure, if not a tad dark. It dabs nicely!