Continuous Flow Systems run chemical reactions by continuously flowing reactants past each other. Pumps control fluid channels holding the reagents and chemical reactions occur at intersections of those pumps. It’s the chemistry version of the Lab On a Chip. Flow chemistry doesn’t have to be small-scale, it’s used in industrial manufacturing, but it can be a powerful tool in the lab as well. The only thing is that cost barrier, when we asked various companies for quotes, we were told it would be ~$20,000 for the bare bones models. The lowest quote we received was $14,500 from the Syrris brand of Blacktrace , for a Educational Flow Chemistry System.
If you really want to Do-It-Yourself, Matthew Penny, Zenobia Rao, Bruno Peniche, and Stephen Hilton have recently put up a paper on the Chemrxiv detailing how to make a Modular 3D Printed Compressed Air Driven Continuous-Flow System. The paper doesn’t have Supplementary Materials up yet though, so we’ll all have to wait for the CAD designs used in the paper.