This is a pretty cool result. Given that they can build a unit that small, one scaling solution is just to put a bunch of units out there (parallelism). Not as

This is a pretty cool result. Given that they can build a unit that small, one scaling solution is just to put a bunch of units out there (parallelism). Not as efficient perhaps but I can't see anything in the paper that would prevent that. Of course a thousand of these units in a 100 x 100 array would only produce about 32 liters of "free" fuel per day. Given this directly impacts SpaceX's plans to colonize Mars one could hope they are funding a few projects with this team as well.