Testing of this:

Specs are 6V, flow rate (found out after testing) is 60ml/min

this is far too slow, and inaccurate, real flow is more like 45ml/min, this means it would take over a minute to pour a cocktail (one pump per reagent), or over 30 seconds if the smallest measure is 25ml.

this is not acceptable, another solution must be found!

Concept as first envisaged: