The file format used for 3D printing on the Ultimaker 2+ Connect is .ufp, or Ultimaker Format Package. This package includes the sliced file (gcode), material information, and a preview of the 3D model. This file format is also used on Ultimaker S-line printers and the Ultimaker 3 series. The included preview is displayed on the touchscreen of your Ultimaker 2+ Connect and in the Digital Factory, to clearly show which model will be printed.
Whereas other Ultimaker 3D printer models will also read and print gcode files, the Ultimaker 2+ Connect is set up to only accept 3D print files in the .ufp format.
This format is selected by default in Cura to save the sliced file. This is used to send print jobs to the printer via the Digital Factory, but also for the offline workflow via USB. If you want to print via USB, select 'Save to file' or 'Save to removable drive' when slicing is complete, and don't alter the file format.
Although Ultimaker Cura offers the possibility to save the sliced file as a gcode, this file will not be recognized by the Ultimaker 2+ Connect when it is saved to a USB drive.
Note: The Ultimaker 2+ Connect is only compatible with Ultimaker Cura 4.8 or higher, and may not accept files generated with third-party slicers. In future firmware versions, the Ultimaker 2+ Connect will be set up to also accept gcode files.