Hey dude, I would recommend a c02 system, something small like
http://ocolabs.com/ now, usually people blow up because of butane c02 on the other hand is safe IMO. If this system doesn't work because it is expensive, I would recommend doing some research at
https://skunkpharmresearch.com/bho-extraction/
Then
https://www.google.com/url?sa=t&sou...ggcMAA&usg=AFQjCNEaBadl0rGh9gt5JIkjgd1tBLAgoA
Basically you can make some really good shatter. What the most important thing IMO is do you want shatter or do you want an oil to make and e liquid, if you want shatter to dab then the above web links are good starts. If you want an oil so you can actually vape then what's really important is to get the residue out from BHO, by decarbing (
https://www.google.com/url?sa=t&sou...ggbMAA&usg=AFQjCNGs620-HsqxxLXzYazXIkhTDuHnNw )
After you decarbing and basically get rid of everything you can easily make your E-Liquid with a oil based honey like product because it is already a liquid at room temp you can make higher ratio's. Let me know if you need any help or other info, I am limited to my knowledge because I have quit the game but still have some good pointers. FYI if you winterize your decarbed product to make it clear and have no fats or lipids I would recommend using a 7ml alcohol to 1g of concentrate to really do the job without loosing on alcohol and let it sit for 24 hours in the freezer.
If you don't want to loose yield then for personally use of vaping use a tank that has really big inlet holes for the E-Liquid it won't clog. Also when cleaning the coil just use some alcohol.