I have noticed a couple of parts in the mangrove collection that have ducts in the filename. A good example would be http://devel.lulzbot.com/TAZ/Mangrove/production_parts/test_parts/carriage_right_idler/ and
There are two files: carriage_right_idler.stl & carriage_right_idler_ducts.stl
What purpose do the ducts serve on these parts? I’m printing these parts and am unsure which to print.