Abstract: Example filters are disclosed herein. In an example, the filter includes a housing including a central axis, an inlet, and an outlet. The central axis extends perpendicularly to a fluid flow direction at the outlet. In addition, the filter includes an outlet flow path defined within the housing that extends angularly about the central axis to the outlet. Further, the filter includes a first plurality of vanes extending from a radially outer surface of the outlet flow path.

Abstract: Example implementations relate to a system comprising a memory resource to store instructions executable by a processing resource. In some examples, the processing resource can execute instructions to perform a calibration procedure for a printing device including a printing component. Responsive to the calibration procedure, the processing resource can execute instructions to deliver a print material arranged in a compound shape to a calibration image on the printing component included in the printing device. Responsive to performing the delivery, the processing resource can execute instructions to measure a print material density of the print material on the calibration image of the compound shape during the calibration procedure via a density sensor included in the printing device. Furthermore, the processing resource can execute instructions to detect an abnormality in the print material density via signal analysis instructions and provide a notification regarding the print material density abnormality.

Abstract: Example filters are disclosed herein. In an example, the filter includes a housing including a central axis, an inlet, and an outlet. The central axis extends perpendicularly to a fluid flow direction at the outlet. In addition, the filter includes an outlet flow path defined within the housing that extends angularly about the central axis to the outlet. Further, the filter includes a first plurality of vanes extending from a radially outer surface of the outlet flow path.

Abstract: Example implementations relate to a system comprising a memory resource to store instructions executable by a processing resource. In some examples, the processing resource can execute instructions to perform a calibration procedure for a printing device including a printing component. Responsive to the calibration procedure, the processing resource can execute instructions to deliver a print material arranged in a compound shape to a calibration image on the printing component included in the printing device. Responsive to performing the delivery, the processing resource can execute instructions to measure a print material density of the print material on the calibration image of the compound shape during the calibration procedure via a density sensor included in the printing device. Furthermore, the processing resource can execute instructions to detect an abnormality in the print material density via signal analysis instructions and provide a notification regarding the print material density abnormality.