Campylodiscus hibernicus is a single-celled freshwater algae in the diatom family. It makes a glass frustule (shell), which is printed here. I started with an STL file kindly shared by Jamie Perrelet from http://www.fractalteapot.com/. I imported the file into Meshmixer to generate supports, which were printed in PVA. This type of object is best printed on an SLA printer, but the Ultimaker handled it pretty well. I'll try to tweak the orientation and print it again.