Well, it turned out that only Nanos project had a logo. But Mercurium is used in some projects other than Nanos, so we fancied to have a logo just for Mercurium itself. Here it is

We have inspired in Mercury roman god representations, like the one below from Hendrik Goltzius (1558(1558)–1617(1617)). In these representations, Mercury is represented as wearing a winged helmet and so we did in our logo. Also to give the idea of a fast prototyping tool, we added some lines after the wing to make it look like swifter.