purpsoefully porous looking texture or mechanical properties

[3Me 0]

I would like to use my two nozzles of the Ultimaker 3 extended to deliberately make a solid section and a porous looking section. In the best case the material is even porous.

 

Usually people try the opposite - make print quality better and not porous - but I would like to achieve this effect.

 

Is there a spetial setting for this? (PLA)

[geert_2 558]

If you use only infill and no wall thickness, you should get a porous model. But I don't know the best settings, nor best infill patterns.