An interdental cleaning device includes a handle. A cleaning head assembly is mounted on the handle. The cleaning head assembly includes a head that is mounted on the handle, the head defining a cavity. An interdental cleaning member is mounted on the head to extend into the cavity, the interdental cleaning member including an interdental cleaning element. A plunger is mounted on the head, the plunger being reciprocally displaceable relative to the head between an operative position in which the plunger is at least partially retracted into the cavity and an inoperative position in which the plunger extends from the cavity. A spring mechanism is interposed between the plunger and the head so that the movement of the plunger into the operative position is against a bias of the spring mechanism. The plunger defines a longitudinally extending passage that is dimensioned to accommodate the cleaning element. The interdental cleaning member is positioned so that the interdental cleaning element extends from a distal opening of the longitudinal passage when the plunger is in the operative position and is positioned within the plunger when the plunger is in the inoperative position.

An interdental cleaning device includes a handle. A cleaning head assembly is mounted on the handle. The cleaning head assembly includes a head that is mounted on the handle, the head defining a cavity. An interdental cleaning member is mounted on the head to extend into the cavity, the interdental cleaning member including an interdental cleaning element. A plunger is mounted on the head, the plunger being reciprocally displaceable relative to the head between an operative position in which the plunger is at least partially retracted into the cavity and an inoperative position in which the plunger extends from the cavity. A spring mechanism is interposed between the plunger and the head so that the movement of the plunger into the operative position is against a bias of the spring mechanism. The plunger defines a longitudinally extending passage that is dimensioned to accommodate the cleaning element. The interdental cleaning member is positioned so that the interdental cleaning element extends from a distal opening of the longitudinal passage when the plunger is in the operative position and is positioned within the plunger when the plunger is in the inoperative position.

Systems, methods, and new file formats are provided for printing 3D microstructures. In some implementations, a new file format is provided that defines 3D objects by a wireframe model expressed as a collection of wires. Wires and their parameters are defined within the new file format, and objects may be processed to support 3D rendering operations. Such methods may be used to print new articles, such as eyelashes, bushes, swabs and other novel items.

Systems, methods, and new file formats are provided for printing 3D microstructures. In some implementations, a new file format is provided that defines 3D objects by a wireframe model expressed as a collection of wires. Wires and their parameters are defined within the new file format, and objects may be processed to support 3D rendering operations. Such methods may be used to print new articles, such as eyelashes, bushes, swabs and other novel items.