I've certainly looked hard at the Rotovape and it would be easy to engineer one, using a simple rotary union, but most of our oil goes into sublingual medication, so we just cook off the solvent and decarboxylate in the same step, making vacuum un-necessary.
Our simple vacuum chamber does an stellar job in the small quantities of carboxylic acid cannabis products that we produce by thin film vacuum purging and it is easy to remove afterwards.
A Rotovape is on the wish list, but the used Perkins Elmer Gas Chromatograph that we just picked up was way higher on that list, because we are tired of shooting blind and relying on only anecdotal information. I under stand how a GC works, but there is zero chance that I could ever engineer one myself.
Next highest on our wish list, is the rest of the equipment that our biochemistry student requires for his tissue culture, synthetic seeds, DNA sequencing experiments, and fraction distillation separating the stream constitutes by refractive index.
I would grab a Rotovape at a price I couldn't refuse, but in retirement am on a fixed income and have to pick and choose toys. We hope that eventually Skunk Pharm Research lease program income will pick up that slack and start to support more and better toys, so I can start to spend my own monthly mad money allowance on other thangs.
Maybe take my tolerant and supportive wife mate on a wild weekend wearing golf balls as big as diamonds for instance.
