Day 122 - Menger Coaster Set, Part 2

Continuing from yesterday, here are the other four interesting slices of a Level 3 Menger Sponge:

STL files: http://www.geekhaus.com/makerhome/day122_mengercoaster5.stl (and 6 and 7 and 8)
Tinkercad link: https://tinkercad.com/things/auZS4Sd7vIe-day-122-menger-coaster-set-part-2
Thingiverse link: http://www.thingiverse.com/thing:213053

Settings: Like yesterday, we used Makerware .3mm/low,for a print time of about 30 minutes per coaster, with color swap just after 20 minutes or so.

Technical notes: See yesterday's post for hints about when to make the filament color swap. As you can see from the picture, the Replicator 2 is giving me some "stringy" behavior on the long traverses of black. I wonder if I could fix this with a temperature change or some other change? If anyone has any ideas please let me know.

UPDATE:  On Day 127 we figured out how to fix the "stringy" problem - change to .2mm/standard layer height. I imagine that change would also work for this model.