Dodecahedron that prints without support – Experiment

This dodecahedron prints without support. I’ve posted this dodecahedron, along with its FreeCAD design file, as an example of how to design and print a hollow dodecahedron.

dodecahedronHalf.stl is half of the dodecahedron. Print two of these, without supports or brim. Print as oriented in the STL: with the open part of the half dodecahedron facing up You may need to tune your printer to successfully print, because the upper bars overhang more than 45° from vertical. This print is a sort of torture test for your printer.
I successfully printed this design in PolyLite PLA on my Lulzbot Mini printer, slicing it using Cura Lulzbot Edition set to the Lulzbot Mini Standard Resolution.
Once you’ve printed the two halves, clean up the edges with a hobby knife. Then glue the two halves together. I used E6000 Craft Glue because it’s more forgiving than superglue.
dodecahedron.FCStd is the design file. I created the design entirely in the Part Design Workbench.
I created the first pentagonal face by Sweeping a cross-section Sketch through a pentagonal Sketch.
I then created a second cross-section Sketch in the same plane as the first cross-section Sketch. To place the second pentagonal face, I created a Datum Plane that passed through one edge of the first pentagon and through the outside face of the 2nd pentagonal face’s cross section. I used a Datum Plane so I wouldn’t have to align anything by eye. I then created the second pentagonal Sketch in that Datum Plane, then did a Sweep of the second cross-section through that second pentagonal Sketch.
Finally, I used a Polar Pattern of five repetitions of the 2nd pentagonal face to create half of the dodecahedron. Printing and assembling two of these halves produces the full dodecahedron.