Finite element method Selective laser melting Structural optimization Thermal ageing Topology optimization finite element analyses mechanical properties polyamide 12 powder recycling selective laser sintering Additives Building process Conventional manufacturing Crane systems Cranes Finite element analyse Key technologies Laser heating Manufacturing IS Manufacturing techniques Multiple interfaces Poly-amide 12 Polyamid Powder recycling Process chambers Production cost Reuse Scanning electron microscopy Shape optimization Sintering