Phoenix tears claims to use Isopropyl Alcohol or Naptha, but if I am going to eat the end product on a regular basis I'd personally use something food safe like pure grain alcohol/ethanol. My guess is that some residual solvent is in the end product and I'd rather have that solvent be something I already consume in moderation. The tech I mentioned above is really more for vaping, so if you were going to orally take the end product you should probably decarb the herb before you use the solvent.  The honey oil or absolute oil r shatter glass at the end can be thinned out with vegetable oil like EVOO or Coconut Oil to make it thin enough to place into piils or a syringe to consume orally.

With regard to veg oil as a solvent there is a guy who claims to be able to use Hemp Oil as the solvent, then he does something at the end called soaping where he uses a base and plant fats to move the actives from the oil into the water where it can then be evaped.  As soon as the guy in finished with his tech he promises to post it to another forum, so I'll post it here in case anyone wants to read or experiment with it.