1. Anon1. Available at: http://www.dm3dtech.com/. (Accessed 14.09.20).
2. Anon2. Available at: https://www.optomec.com/3d-printed-metals/lens-technology/. (Accessed 14.09.20).
3. Anon3. Available at: http://www.rpm-innovations.com/laser-systems. (Accessed 14.09.20).
4. Anon4. Available at: https://www.beam-machines.com/. (Accessed 14.09.20).
5. Anon5. Available at: https://us.dmgmori.com/products/machines/advanced-technology/additive-manufacturing. (Accessed 14.09.20).