The 8mm single pulley, assembled with a set screw, is used on all Ultimaker 2 series, Ultimaker 3 series, and Ultimaker S-Line printers.
This is an official Ultimaker part for the following machines:
Ultimaker 2+ Connect
Ultimaker S3
Ultimaker S5
Ultimaker S7
Ultimaker 3
Ultimaker 3 Extended
Ultimaker 2+
Ultimaker 2 Extended+
Ultimaker 2 Go
Ultimaker 2
Ultimaker 2 Extended
All Ultimaker 2 series and Ultimaker 3 series printers use 8 of these single pulleys per machine; the Ultimaker S5, Ultimaker S3, and Ultimaker S7 use 7.
Ultimaker AA Print Core (0.4mm) (UM3/S5/S3/S7/Factor4)
$169.00
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...
These are the short belts that connect the X and Y motors to the axes. Official Ultimaker Spare Parts for the following printers: Ultimaker 2+ Ultimaker 2 Extended+ Ultimaker 3 Ultimaker 3 Extended Ultimaker 2 Go Ultimaker 2 Ultimaker 2 Extended Ultimaker S5...
For Maintaining Your Nozzles Using the Ultimaker  cleaning filament is the most effective way to unclog and keep print cores and nozzles in optimal condition. Using UltiMaker  cleaning filament is the most effective way to unclog and keep print cores...