Let me begin this second phase by introducing my Poormans Rotovap.
A Rotovap or rotary evaporator is a common piece of equipment found in most any high-end cannabis processing lab nowadays. It's basically a modified distillation setup. There is a glass flask to hold the "charge" or solution to be distilled in a container of heated water.
The main difference is the flask holding the charge solution is mounted such that it can be constantly rotated. This does two things. It keeps the heat evenly dispersed all around and it stirs the solution to speed up the evaporation process. A vacuum is applied to cause the charge to evaporate faster. From there the distillate (in this case ethanol) is collected in a cooling chamber and dripped into another flask. What's left in the first flask is what we're after. That's the purified cannabis extract or "oil"
These cost thousands of dollars depending on size and features. They also require a fair amount of charge solution to work properly. A few millimeters won't cut it so even if I could afford one, it would be of no use to me on such a small scale. There is (like there always is) another way to accomplish basically the same thing.
Meet my Poormans Rotovap
What I have here is a coffee cup warmer mounted, with double sided tape, to a dental vibrator unit. This gets me the mild heat I need to evaporate the ethanol (more on that, later) and the constant movement of the solution to increase the surface tension and speed up the process.
Very simple, low cost solution anyone can afford. This dental vibrator sells for under $100 on Ebay. Some others as low as $50.