peristaltic

Perhaps you could make a nano (well, micro) scale peristaltic pump out of a really small geneva linkage.

This naturally brings the TDS down, which triggers relays for peristaltic pumps to add a given ratio of nutrients.

One of the large benefits of peristaltic pumps is that the only thing that the liquid touches is the tube.

Maybe you could use some sort of Teflon coated radio-penetrable container and a peristaltic pump.

Perhaps higher quality peristaltic pumps (higher flow rate, less noise) in combination with more ingredient chambers would push it over the edge.

Pumps driven by impellers create cavitation that cracks open microorganisms, and things like peristaltic pumps which avoid this can't handle these volumes.

In detail it consists of 6 x peristaltic pumps, 3 x L298N motor driver, 3 x PCF8574 io expander and an esp32.

Aren't the linked peristaltic pumps a little bit too slow for this purpose?

It always surprises me when I see peristaltic pumps used in these projects, rather than optics.

It uses peristaltic pumps to move the different ingredients to the cup.

The pumps are peristaltic[1] though so the only part that touches alcohol is the tubing so it is simple to swap out for another material.

Various RepRap extruders use peristaltic pumps to print chocolate, ceramics, etc.

The way they "take steps" is inherently peristaltic.

The first time I heard of how many neurons the gut has, I went: "well obviously, there's a lot of receptors and muscles to support peristaltic movement; plus probably some start to end connection for proper synchronization and total volume management - it just has to be processed somehow and locally (in the gut, as opposed to the far brain) seems like an obviously good choice".

Peristaltic pumps are good, and they usually require soft hose, such as silicone.