How do you do RSO. I've always wanted to try it but it takes a lot of product I think.
You can make RSO out of a couple grams if you want to. Doesn't have to be lots. Basically add some solvent, (99% ISO, EverClear, Naphtha, acetone etc), filter and either evap off the solvent or recover it with a still. I use one of those 4L countertop stills for some things then a bigger steel pot still from Amazon for large batches or naphtha as the seal on the countertop still doesn't like naphtha. Used it to cook 3 cans of Coleman's Camp fuel down to clean it up to make oil with.
Temp control on this one.
This cost about the same as the countertop unit but holds 12L. Had to make my own gaskets as the ones that came with it fell apart with naphtha.
For special projects I can use this rig. Works as is but need a couple parts so I don't need adapters to make it all fit. Will be able to feed from a larger container and run lots in one go.