The Ultimaker Printcore AA has a diameter of 0.25, 0.4 or 0.8 mm. It was developed exclusively for use with build material. The Printcore achieves the best results with the Ultimaker materials Nylon, PLA, CPE, CPE+, ABS, PP and TPU 95A. When printing with support material (only with BB Core) UltiMaker recommends only PLA or Nylon as build material.