These are official spare parts compatible with the UltiMaker S3.
Timing Belt 200 x2 (UM2/UM3/S5/S3/S7/Connect)
$19.98
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...
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