Pepakura can export an obj of the textured model, but not with flaps. If you have the latest version, or past ver3 I think, you can actually scrub through an animation of the model being unfolded with flaps and do screen grabs. I have done that myself in the past.
You can import the obj into blender and do renders of it from there, possibly deleting unwanted faces to show construction.
Honestly, I think it would be easier to take assembly photos. Use cardboard and pins to hold open faces and flaps if you need to.
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