Abstract: Computer-implemented methods, devices, and systems for matching a requester with at least one requestee. An input representing a request from the requester is received. A top-k learning tree-based deep model is applied to at least one node embedding representing at least one requestee successively across at least one time window. Each output from each time window is concatenated with the input into a neural network input. A neural network determines each probability for the input to match each requestee. At least one requestee is presented to the requester for approval based on the probability for the input to match the requestee.

Abstract: An extruder assembly for a three-dimensional printer having one nozzle, attached to a heating block, a temperature control element for controlling the temperature of the heating block, a mixer, a heat sink arranged between the heating block and the mixer. The extruder assembly is suitable for 3D printing.

Abstract: A printer management system includes one or more printing devices having a printing area for printing according to a digital file, an access area through which a user may access the printing area, and a locking mechanism configured to lock the access area preventing access to the printing area. A management server is communicatively coupled to the one or more printing devices over a communication network and is configured to receive a print request from one or more user devices or one of the one or more printing devices to print the digital file, transmit the digital file to one of the one or more printing devices, and transmit commands to lock and unlock the locking mechanism of the one or more printing devices. In one embodiment the management system is configured to update a printing status of each of the one or more printing devices.

Abstract: A printer management system includes one or more printing devices having a printing area for printing according to a digital file, an access area through which a user may access the printing area, and a locking mechanism configured to lock the access area preventing access to the printing area. A management server is communicatively coupled to the one or more printing devices over a communication network and is configured to receive a print request from one or more user devices or one of the one or more printing devices to print the digital file, transmit the digital file to one of the one or more printing devices, and transmit commands to lock and unlock the locking mechanism of the one or more printing devices. In one embodiment the management system is configured to update a printing status of each of the one or more printing devices.