by JBFromOZ, published
It was a Nightmare..
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exported as 2 STL's, print first ( white) in white at 0.3mm layer height, print will finish at Z = 0.9 edit 2nd STL (black) so it does not automatically home at the beginning of the print
change filament over from white to black.
home X and Y (do not move Z) G92 E0 Z0 (sets Z to 0, without moving Z) then run the print
black will lay down over the white print,
print a pair of hooks, http://www.thingiverse.com/thing:30598 then assemble (i use a soldering iron to melt the hoops of the earrings closed after assembly.