Tip for all those with Pepakura...

[Lex]

Don't know if others are already doing this... But anyway go to colour settings and set the colour for faces without materials to black, or anything clearly distingguishable from your model colours. Because I was frustrated this morning when I developed a model and then found I had one face uncoloured, so I had to go back to the model and change that face, and repeat everything in Pepakura again...