A hearing aid earpiece (1) is provided, that is custom fitted to the individual shape of the ear canal of a user and manufactured in a rapid prototyping process. The earpiece comprises a sound conduit (3) that is adapted for conveying an acoustic signal from an acoustic inlet port towards an acoustic outlet port and wherein the sound conduit is looped such that at least one geometrical plane will intersect the sound conduit at least three times thereby providing a length of the sound conduit exceeding a largest outer dimension of the hearing aid earpiece. The invention also relates to a hearing aid comprising such a hearing aid earpiece and a method for manufacturing such an earpiece.