Professional 3D printing just got a whole lot easier with Ultimaker’s new Print Cores! These material-matching Print Cores will help maximize print performance and machine uptime, allowing you to get the most out of your Ultimaker 3 printer. The Print Core AA, also known as the Build Core, is specifically designed for all primary materials such as PLA, ABS, CPE/PETG, and Nylon. Use two Build Cores for ultimate artistic freedom in your dual color prints. This listing is for the 0.40mm Build Core