Waterjet cutters are often so expensive and esoteric that I’ve only ever seen one in an actual lab. But in principle they should be a fantastic alternative when CNC mills, laser cutters, knife printers or 3D printers can’t get you where you need to be.
As the Applied Science youtube channel shows, with some know how you can build a waterjet cutter out of a $150 pressure washer.
It’s field dependent, but nowadays a lot of papers will have preprints on the arXiv or bioRxiv. So if your looking for a paper and Google Scholar keeps sending you to journals behind pay walls, see if these preprint servers have a pre-print of the same paper.
For various experimental applications, microbial cultures at defined, constant densities are highly advantageous over simple batch cultures. That’s where a turbidostat comes in, which keeps a culture at a constant turbidity.
An anonymous contributor wrote in about making laser shutters using hard disk drive rotary voice-coil actuators. The contributor’s lab has made a couple of these which are controlled via an Arduino, at a much lower cost than shutters from Thorlabs or similar. If that first paper doesn’t have you convinced, here’s another one.