The CENTO3 project originated from a previously undisclosed collaboration dating back to 2001 between Achille Castiglioni and architect Gianfranco Cavaglià, focusing on writing instruments. The design, characterized by a trilobate shape, proved too intricate for production techniques available at the time and was shelved. Each CENTO3 instrument undergoes 3D printing using an exceptionally durable, sustainable, and lightweight Graphene/PLA filament. The additive manufacturing process imparts a subtle nonslip texture to the surface, rendering each piece a distinctive artifact, as every instrument is individually printed. Additionally, the ergonomic trilobate shape ensures that CENTO3 remains stable and prevents it from rolling off the table.