i am using your objexporter to export my models to pepakura to make paper model of them. i am having this issue:
if my model has different coloured faces like this:

, exported obj file look like this in pepakura:

and i am sure all edges connected. if i export kmz4 with skp6, i have no problems with pepakura. but you know sketchup 2016 is newer and faster than old one. i want to use the 2016 but this objexporting issue botters me. any ideas on this?