MakerBot Print is our newest print-prepration software, which supports native CAD files and STL assemblies,
allows you to interact with all your printers via the Cloud, and many other exciting new features.
Looks very sleek!
I can recommend using/printing my spidercore for this: ;-)https://www.thingiverse.com/apps/customizer/run?thing_id=1808387
it has a megaminx (12 arm variety). What size of (ball) core did you use? 30 mm? or did you use a commercial megaminx core?
My thing should be loaded with following parameters: (explanation in source)
Number_of_Arms = 12.1;