I have not printed the model yet, but when viewing it in Adobe Reader the fold and score lines do seem to be on the light side but nothing to bad. I saw the post over at pm and I think the problem the builder had was with the scoring lines where there are texture. They seem hard to see.
Would be nice if Pepakura add a feature that marks the score/fold lines outside the texture. That way you do not have ugly lines across the texture, yet you still have clearly visible marks to guide you.
Only other way is play around with the color of the score/folding lines.