Abstract: Three-dimensional printing pens and related systems and methods are provided. A three-dimensional printing pen may include a plurality of cartridges, each cartridge having a hollow cartridge body sized and shaped to include a colored thixotropic paste, a color of each thixotropic paste being different from a color of another thixotropic paste, and a plurality of nozzles, each nozzle fluidly communicatively coupled to a corresponding cartridge. The three-dimensional printing may further include a motor unit operably coupled to the plurality of cartridges, the motor unit operable to expel the colored thixotropic paste from each cartridge through the corresponding nozzle, a mixing tip fluidly communicatively coupled to the plurality of nozzles, the mixing tip sized and shaped to dispense therethrough one or more of the colored thixotropic pastes in a form of an output thixotropic paste, and a projection module.

Abstract: Three-dimensional printing pens and related systems and methods are provided. A three-dimensional printing pen may include a plurality of cartridges, each cartridge having a hollow cartridge body sized and shaped to include a colored thixotropic paste, a color of each thixotropic paste being different from a color of another thixotropic paste, and a plurality of nozzles, each nozzle fluidly communicatively coupled to a corresponding cartridge. The three-dimensional printing may further include a motor unit operably coupled to the plurality of cartridges, the motor unit operable to expel the colored thixotropic paste from each cartridge through the corresponding nozzle, a mixing tip fluidly communicatively coupled to the plurality of nozzles, the mixing tip sized and shaped to dispense therethrough one or more of the colored thixotropic pastes in a form of an output thixotropic paste, and a projection module.