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.
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.
The EyeWriter is a DIY low-cost eye-tracking apparatus + custom software that allows people to draw using only their eyes. Eye tracking solutions generally cost upwards of ten grand, but this is just $200 in parts.