These are official spare parts compatible with the UltiMaker S3.
Ultimaker AA Print Core (0.4mm) (UM3/S5/S3/S7/Factor4)
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A genuine 'AA' style Ultimaker 3 print core with a 0.4mm nozzle. Can be used for printing with a range of materials including Tough PLA, Nylon, PLA, CPE, CPE+, ABS, PETG, PP, and TPU 95A. Compatible with the following Ultimaker...
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Ultimaker AA Print Core (0.8mm) (UM3/S5/S3/S7/Factor4)
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A genuine 'AA' style Ultimaker Print Core with a 0.8mm nozzle. Can be used for printing with a range of materials including Nylon, PLA, CPE, CPE+, PC, PP, and TPU 95A.  Compatible with the following Ultimaker printers: Ultimaker 3 Ultimaker 3 Extended...
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