1 . A print material component comprising: a print apparatus interface to couple the print material component to a print apparatus, the print apparatus interface defining a first port; a print particle container comprising: a periphery defining a second port; and a chamber structure defining a chamber coupled to the second port, the chamber to contain print particles; and a container interface comprising: a material transfer interface coupled to the first port and coupleable to the second port; a wall defining a boundary of a recess corresponding to a shape of the periphery of the print particle container; and a surface defining: a guide feature to guide rotation of the print particle container about an axis along a direction of the recess; and a key feature rotationally asymmetric with respect to the periphery, the key feature to guide movement of the second port towards the material transfer interface.
2 . The print material component of claim 1 , wherein: the chamber of the chamber structure is tubular and the guide feature guides rotation about the axis of the tubular chamber.
3 . The print material component of claim 1 , wherein: the material transfer interface is off-axis with respect to the axis along the direction of the recess.
4 . The print material component of claim 1 , wherein: the periphery comprises a rim extending from a neck of the container, the rim including a rotationally asymmetrical key feature corresponding to the key feature of the surface of the container interface.
5 . The print material component of claim 1 , wherein: the periphery comprises a rim around a neck of the container; and the second port is located on a side wall of the rim or located on a surface of the rim facing away from the print particle chamber.
6 . The print material component of claim 1 , wherein: the rotationally asymmetric key feature is: an angled surface with respect to the wall; or a cut-out shape particular to rotation of the periphery of the print particle container based on a corresponding key feature located on the periphery of the print particle container.
7 . The print material component of claim 1 , wherein the periphery includes a lofted feature including: a surface plane to guide rotation of the print particle container about an axis that is substantially perpendicular to the rotationally asymmetric surface plane; and a cross-section parallel to the surface plane and having a different shape with respect to the surface plane to generate pressure upon rotation of the print particle container.
8 . The print material component of claim 1 , wherein: the surface of the container interface includes a plurality of key features that correspond to levels of rotation and levels of movement of the print particle container towards the material transfer interface of the print material component.
9 . A toner receptacle comprising: a receptacle material interface; a mechanical interface coupled to the receptacle material interface, the mechanical interface comprising: a wall defining a recess to receive a toner container couplable to the receptacle material interface via a container material interface; a guide feature extending from the wall, the guide feature to guide rotation of the toner container about an axis of the mechanical interface; and an asymmetric key feature embedded in the guide feature to allow movement of the container material interface towards the receptacle material interface upon rotation of the toner container about the axis of the mechanical interface.
10 . The toner receptacle of claim 9 , wherein the asymmetric key feature is: a protrusion extending from the wall; a cavity recessed into the wall; or an angle of a surface of the guide feature.
11 . The toner receptacle of claim 10 , wherein: the receptacle material interface is located off-axis with respect to the axis of rotation of the mechanical interface.
12 . The toner receptacle of claim 11 , wherein: the asymmetric key feature includes a first keying shape in first key direction with respect to insertion and a second keying shape in a second key direction with respect to rotation, the first and second keying shapes being: a recess corresponding to a protrusion of a rim of a toner container; or a protrusion corresponding to a recess of a rim of a toner container.
13 . A print particle container to supply print particles to a print particle receptacle of a host device, the print particle container comprising: a periphery defining a port coupled to a chamber, the periphery including a rotationally asymmetric surface plane to guide rotation of the container about an axis that is substantially perpendicular to the rotationally asymmetric surface plane; and a protrusion extending from the periphery, the protrusion including a face with a key feature defined by edges rotationally asymmetric with respect to the periphery, wherein: the edges of the key feature enable movement of the port of the print particle container to a port on a shell associated with the print particle receptacle having a complementary face corresponding to the edges of the key feature; and the edges of the key feature hinder movement of the port of the print particle container towards a port of a shell having a dissimilar face that does not correspond to the edges of the key feature.
14 . The print particle container of claim 13 , wherein: the key feature is an angle of a surface of the periphery that, upon rotation of the print particle container, generates pressure to spatially seal the port of the print particle container to the port of the shell associated with the print particle receptacle; or the key feature is a tooth or cavity that, upon rotation of the print particle container, guides the key feature past the complementary face and guides the port of the print particle container towards the port of the shell associated with the print particle receptacle.
15 . A print particle container, comprising: a print material chamber; a material transfer interface coupled to the print material chamber; and a mechanical interface including a wall comprising an asymmetrically-located key feature that, upon rotation of the print particle container, generates a sealing force substantially perpendicular to the direction of rotation and towards the material transfer interface.
