Semi-processed resins; semi-processed conductive resins; semi-processed photopolymer resins; semi-processed thermosetting resins; semi-processed thermoset plastics; semi-processed thermoset conductive plastics; semi-processed thermoplastic filaments used for 3D printing; thermoplastic elastomers; thermoplastic elastomers in the form of conductive filaments, conductive sinterable powders and conductive sinterable beads