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It's an icosahedron! I made this for a friend of mine, and I thought I might as well share. I don't think there's an icosahedron that's hollow already up here.
I'll upload my source file too. This was a fun object to model, because it can be constructed with three perpendicular golden rectangles.
I sliced mine at 50% scale, and with 0.4 mm layers the walls ended up being 3 extrusions thick, which was just about right. Of course, the top will need to be bridged, so make sure you've got your temperature and feed rate settings calibrated or it may droop!
Icosahedron, hollow by kyle_c is licensed under the Creative Commons - Attribution - Share Alike license.
So what's this mean?
We're sure kyle_c would love to see what you've printed - take a photo and share it on Thingiverse as a Make.
To post a Make simply visit this Thing again and click I Made One to start uploading your photo. You can also download the Thingiverse Mobile app (available via Google Play and Apple App Store) to take a photo and upload your Make right from the app!