Not affiliated with this project other than as a backer, but it's very cool:
For those unfamiliar, "vase mode"(the setting has various names in the different slicers) changes the way an FDM machine prints out an object. Rather than a hollow 3 dimensional form with some structural infill pattern, it prints the entire object as a hollow container with no "top" and a single wall/perimeter. By swapping to a larger nozzle size(usually 0.8mm, rather than the 0.4mm standard one) the resulting parts still have some rigidity to them(and could be further reinforced with, for example, some expanding foam), but importantly they print much more quickly than traditional FDM prints - as little as 1/4 the time - and with as little as half the material. The reason you don't tend to see this method used is it requires a much more involved design process since every piece must be printable with no supports and can have no gaps, and the way they've addressed that for these models is genuinely impressive IMO
There's a decent mix of parts including ruined versions, and the all-in pledge is €40.
This seems to be the "sizzle reel" but there's plenty more images on the page: