If you were wondering what the current limits in 3D-printing resolution are… check this out:

Lithuania sends Pope Francis ‘world’s smallest’ nativity scene for Christmas

So how small is it? Overall diameter is 0.3 mm, and the baby Jesus figure is smaller than a human cell.

Details are sparse, such as what the figures are actually made of, but presumably it’s some sort of resin. I wonder if hard limits are close… not only the wavelength of the laser used, but perhaps even limitations of the material itself. At some point you’re down to molecules, but limits might kick in even before then. How is the resin layered up? Or is the laser focused to an insanely precise point within the resin?