Part having a porous structure and related manufacturing method

A part, comprising:

• a porous structure comprising cellular pores and formed at least in part by the periodic repetition of a basic pattern, each cellular pore being delimited by a wall, made of a metal or a polymer, having a parietal porosity in a range of from 5 to 80% and comprising parietal pores with a mean size less than the mean size of the cellular pores,
• wherein the porous structure is obtained by shaping a powder using an additive manufacturing technique comprising laser powder bed fusion or selective laser sintering,
• wherein a mean size of the parietal pores is less than 500 μm, in which at least 85% of the parietal pores are smaller than 200 μm, and in which more than 50% of the parietal pores are smaller than 50 μm, and
• wherein the parietal porosity does not vary by more than 20% between two different zones of volume equal to three times the cube of the thickness of one of the walls.