Abstract: A print head assembly for printing an ink on a substrate having a printing pin member having a tip; a wetting system having an ink reservoir, the wetting system being configured to transfer ink from the ink reservoir to the tip of the printing pin member; and a charging system operably coupled to the printing pin member, the charging system configured to apply a high voltage charge to the printing pin member resulting in the ink on the tip of the printing pin member to be deposited upon the substrate.

Abstract: A print head assembly for printing an ink on a substrate having a printing pin member having a tip; a wetting system having an ink reservoir, the wetting system being configured to transfer ink from the ink reservoir to the tip of the printing pin member; and a charging system operably coupled to the printing pin member, the charging system configured to apply a high voltage charge to the printing pin member resulting in the ink on the tip of the printing pin member to be deposited upon the substrate.

Abstract: A 3D printing system configured to embed and orient reinforcing fibers in a printable matrix material in at least three directions, wherein at least one of the directions is non-parallel with a plane defined by two other of the directions. The 3D printing system may be configured to deposit a layer of printable non-metallic material along a printing path on a contoured printing surface to form a 3D printed article. The system can carry out a method of 3D printing a fiber-reinforced article that includes the steps of: depositing a plurality of layers of printable matrix material one over another to define a three-dimensional shape of the article; and embedding a reinforcing fiber in the printable matrix material during the step of depositing, with the reinforcing fiber extending into more than one of the plurality of material layers.

Abstract: A 3D printing system configured to embed and orient reinforcing fibers in a printable matrix material in at least three directions, wherein at least one of the directions is non-parallel with a plane defined by two other of the directions. The 3D printing system may be configured to deposit a layer of printable non-metallic material along a printing path on a contoured printing surface to form a 3D printed article. The system can carry out a method of 3D printing a fiber-reinforced article that includes the steps of: depositing a plurality of layers of printable matrix material one over another to define a three-dimensional shape of the article; and embedding a reinforcing fiber in the printable matrix material during the step of depositing, with the reinforcing fiber extending into more than one of the plurality of material layers.

Abstract: A printing device includes a nozzle and an extractor. An electrostatic extraction field is generated at the extractor and at a discharge opening of the nozzle to extract polarized ink from the nozzle for deposition on a printing substrate. The extractor includes an electrically conductive portion for application of one side of a voltage potential to generate the electrostatic field. The extractor can be in the form of an extractor plate with an opening through which the extracted ink passes, or the extractor can be in the form of another nozzle. The printing device provides a directionality field that affects the trajectory of the extracted ink. The directionality field can include the electrostatic field or a gas flow field. The printing device is useful for electrohydrodynamic jet, or e-jet, printing on a non-conductive substrate.

Abstract: Provided are various methods and devices for electrohydrodynamic (E-jet) printing. The methods relate to sensing of an output current during printing to provide control of a process parameter during printing. The sensing and control provides E-jet printing having improved print resolution and precision compared to conventional open-loop methods. Also provided are various pulsing schemes to provide high frequency E-jet printing, thereby reducing build times by two to three orders of magnitude. A desktop sized E-jet printer having a sensor for real-time sensing of an electrical parameter and feedback control of the printing is provided.

Abstract: A printing device includes a nozzle and an extractor. An electrostatic extraction field is generated at the extractor and at a discharge opening of the nozzle to extract polarized ink from the nozzle for deposition on a printing substrate. The extractor includes an electrically conductive portion for application of one side of a voltage potential to generate the electrostatic field. The extractor can be in the form of an extractor plate with an opening through which the extracted ink passes, or the extractor can be in the form of another nozzle. The printing device provides a directionality field that affects the trajectory of the extracted ink. The directionality field can include the electrostatic field or a gas flow field. The printing device is useful for electrohydrodynamic jet, or e-jet, printing on a non-conductive substrate.

Abstract: Provided are various methods and devices for electrohydrodynamic (E-jet) printing. The methods relate to sensing of an output current during printing to provide control of a process parameter during printing. The sensing and control provides E-jet printing having improved print resolution and precision compared to conventional open-loop methods. Also provided are various pulsing schemes to provide high frequency E-jet printing, thereby reducing build times by two to three orders of magnitude. A desktop sized E-jet printer having a sensor for real-time sensing of an electrical parameter and feedback control of the printing is provided.

Abstract: Provided are various methods and devices for electrohydrodynamic (E-jet) printing. The methods relate to sensing of an output current during printing to provide control of a process parameter during printing. The sensing and control provides E-jet printing having improved print resolution and precision compared to conventional open-loop methods. Also provided are various pulsing schemes to provide high frequency E-jet printing, thereby reducing build times by two to three orders of magnitude. A desk-top sized E-jet printer having a sensor for real-time sensing of an electrical parameter and feedback control of the printing is provided.

Abstract: Provided are various methods and devices for electrohydrodynamic (E-jet) printing. The methods relate to sensing of an output current during printing to provide control of a process parameter during printing. The sensing and control provides E-jet printing having improved print resolution and precision compared to conventional open-loop methods. Also provided are various pulsing schemes to provide high frequency E-jet printing, thereby reducing build times by two to three orders of magnitude. A desk-top sized E-jet printer having a sensor for real-time sensing of an electrical parameter and feedback control of the printing is provided.