Editorial 1 Tribologie + Schmierungstechnik · volume 71 · eOnly special issue 2/ 2024 DOI 10.24053/ TuS-2024-0027 In this e-only issue selected articles from the recent past focus on the importance of 3D-Printed components in tribological use. Gert Wahl et.al. report on “3D-Printed Reaction Bonded Silicon Carbide as a Ring Material in Axial Face Seals”. Optimized Reaction bonded silicon carbide allows forming of much more complicated shapes and seal ring designs. By using 3D-Printed silicon carbide first fundamental design studies imply the potential of producing seal rings with an additional functionality. Felix Harden et.al. report on “Wear behaviour of additive manufactured polymer-polymer sliding combinations”. Additive manufacturing becomes more and more important due to its unrivalled design and materials freedom, e.g. for polymer-polymer sliding combinations. Not only the sliding combinations but also the understanding of the influence of printing parameters are important. Thus, influences of printing orientation and material combination on the wear behaviour were investigated. Christian Orgeldinger et.al. report on “Influence of manufacturing-related effects on the tribological behaviour of printed components in the ADAM process”. They analyse the extent to which components printed with the Atomic Diffusion Additive Manufacturing (ADAM) process are suitable for use in tribomechanical systems. For tool steel D2 against 100Cr6 counterparts first tribological investigations with the ADAM process show great optimization potential for possible applications in the field of forming technology. The 25 th International Colloquium is only one year away and as a reference you will find exemplarily in detail a publication presented at the 24 th International Colloquium Tribology with the title “Performance of Sustainable Lubricants in Electric Vehicle Transmissions: Ageing Effects”. Polyalkyleneglycol-based (PAG) lubricant was aged in a transmission test rig under different torque/ speed regimes. The aged PAG was compared to mineral oil lubricant utilizing rheological and tribolocical tests. 27-29 th of January 2026 the 25 th International Colloquium Tribology will take place and I’m sure the spirit of Wilfried Bartz will be carried on for this anniversary event. His spirit of using Tribology to excel technology by talking to each other I personally experienced first in 1988. Many International Conferences Tribology followed and Wilfried Bartz mentioned to me once that he could not understand why so many people from all over the world came to the small village of Ostfildern in the cold month of January. We all know why and seeing many younger tribologists at the event he started slightly overcomes the sadness that he survived only 23 of his International Colloquiums Tribology. Please enjoy reading this e-only issue and remember Tribology is everywhere. Your editor-in-chief Manfred Jungk Focus 3D-Printing and 25 th International Colloquium Tribology