Tenderbutton would be proud-

In case you need to create a monolayer of lipids inside a spherical flask and don’t to spend $3000 on a commercial rotary evaporator, this is the design you need. Justin Ingram and I set out to build such a device from things found around the lab for a small fraction of the cost.

μblog: engineering from the trenches » How to make a rotary evaporator on a budget – Link.