Hi everyone.
I’m building papercraft sculpture , using the Pepakura to unfold 3D model.
Until now, I used already made Pepakura models, but for the next one, I would like to transform a lovely cat, all in curves, into the same lovely cat, but with buildable surfaces…
Does anyone have a trick or a plug in to do this kind of thing ? Cause doing it edge by edge just take a lifetime and doesn’t look that well, with only triangles…
Thank you for your upcoming help ! 
Ilho
Have you looked at the SubD or Vertex Tools plugins?
Flatten Faces : Extension | SketchUp Extension Warehouse
I think Pepakura can import .obj files. Try one of the free obj exporters from SketchUcation.
Here’s the list of files it can import, which does include STL, KMZ, and KML:
Metasequoia (.mqo) * Highest compatibility
Wavefront (.obj)
3D Studio (.3ds)
Lightwave (.lwo)
AutoCAD (.dxf)
STL (Binary format) (.stl)
Google Earth 4 (*.kmz, .kml)
Hexa Great (.6kt, *.6ks)