US Patent 12103214 Hand-held three-dimensional drawing device

A drawing device can include a housing configured for to be held in user's hand, shaped to allow manipulation of the housing like a pen, and include a loading mechanism that supports or drives material toward a nozzle assembly of the device. The nozzle assembly has an exit nozzle from which material can be extruded. The drawing device can be configured to receive a cartridge assembly that can be coupled to the housing and be advancement mechanism and/or an automatic retraction mechanism, and allow for multiple operations, including the readying of additional material to be performed using a streamlined, synergistic activation of components, and facilitate disassembly and cleaning.