Three-dimensional porous structures comprising multiple moulded layer modules with interconnected channels in all 3D, in particular substantially axial and/or radial directions. The three-dimensional porous moulded-multilayer product (2) comprises an assembly of a plurality of moulded layer modules (1) which in turn comprise a plurality of through-holes between the layer surfaces of said moulded layer module (1) and a plurality of longitudinal recesses on at least one of the layer surfaces of said moulded layer module (1), along at least two different directions, such that when assembled with the layer surface of another moulded layer module (1) longitudinal channels are formed wherein said through-holes and recess channels are interconnected. The production method comprises assembling of the moulded layer modules (1) by sintering, welding, ultrasonic welding, or applying rigid junctions, screws, spikes, rivets, snap fits, or combinations thereof.
