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Yes, it is PET. I believe I used default Prusa PET settings in Slic3r PE.
-0.2 Layer height
...but the geometry is not difficult to print. I am sure, you could you any reasonable, faster setting as well. Especially higher layer height will not have a big quality influence.
Which slicing program are you using? In Slic3r just hit "Split" button and the STL will be exploded into single objects.