Just last week…
Needed to remove some ethanol. No rotovap at the moment, nor could I find a rice cooker.
Didn’t want to go above 35C on the evap anyway.
Dug around in the scrap pile and came up with the “retrovap”.
Blowing ethanol to atmosphere at 30C using a TRS-21… using a cold trap as the boiler.
Added the gauges because: everything is Just Better with instrumentation 
The temptation to build a small FFE was hard to resist, but then my request for a rotovap would have been ignored…