Abstract: In some examples, a printhead includes a firing chamber to receive printer fluid, an ejector positioned in the firing chamber to eject printer fluid droplets from the printhead, and a nozzle in fluid communication with the firing chamber. The printhead can further include an impedance sensor positioned in the firing chamber to contact printer fluid to measure impedance values of the printer fluid. The impedance sensor can be connectable to a controller to transmit impedance values of printer fluid to the controller.

Abstract: The present disclosure is drawn to ink sets, material sets, and 3-dimensional printing systems. An ink set can include a pretreat composition that includes a metal chloride salt, a conductive fusing ink including a transition metal, and a second fusing ink. The second fusing ink can include a fusing agent capable of absorbing electromagnetic radiation to produce heat.

Abstract: The present disclosure is drawn to material sets for 3-dimensional printing. The material set can include a thermoplastic polymer powder having an average particle size from 20 ?m to 100 ?m, a conductive fusing ink comprising a transition metal, and second fusing ink. The second fusing ink can include a fusing agent capable of absorbing electromagnetic radiation to produce heat. The second fusing ink can provide a lower conductivity than the conductive fusing ink when printed on the thermoplastic polymer powder.

Abstract: In a three-dimensional printing method example, a pre-treatment coating is formed on a part precursor by applying and drying, alternatingly: a polycation solution including a chloride ion and a polyanion solution including a sodium ion to form at least two layers. An ink is selectively deposited on the pre-treatment coating.

Abstract: The present disclosure is drawn to a dispersed magenta pigment blend, including a first pigment including Pigment Violet 19 and Pigment Red 122, or Pigment Red 282; and a second pigment including Pigment Red 150. The weight ratio of the first pigment to the second pigment can be from 50:50 to 80:20 by pigment solids content.

Abstract: The present disclosure is drawn to a magenta pigment blend, a magenta ink, and a method of formulation a magenta pigment blend. The magenta pigment blend can be a first pigment including a solid solution of Pigment Violet 19 and Pigment Red 122, or Pigment Red 282; and a second pigment including Pigment Red 150. The weight ratio of the first pigment to the second pigment can be from 50:50 to 80:20 by pigment solids content.

Abstract: The present disclosure is drawn to inkjet inks and related methods. The inkjet ink includes water, from 5 wt % to 50 wt % of an organic solvent system, from 2 wt % to 9 wt % pigment solids, from 0.1 wt % to 3 wt % polyurethane binder, and from 0.4 wt % to 1.5 wt % of an oleyl or stearyl type polyoxyethylene glycol ether surfactant.

Abstract: In some examples, a printhead includes a firing chamber to receive printer fluid, an ejector positioned in the firing chamber to eject printer fluid droplets from the printhead, and a nozzle in fluid communication with the firing chamber. The printhead can further include an impedance sensor positioned in the firing chamber to contact printer fluid to measure impedance values of the printer fluid. The impedance sensor can be connectable to a controller to transmit impedance values of printer fluid to the controller.

Abstract: A fluid ejection structure can include thermal resistors, a substrate, layers on the substrate, wherein said layers can include a region proximate to the resistor that has reduced field oxide.

Abstract: A fluid directing assembly can comprise a molded support comprising a modified epoxy molded compound which includes epoxy resin, cross-linker, filler, and is devoid of wax release agent. The assembly can also include a silicon die attached to the molded support and wherein the silicon die and the molded support define a fluid directing channel.

Abstract: The present disclosure is drawn to a pigment-based inkjet ink and methods. The inkjet ink includes water; from 2 wt % to 9 wt % pigment solids; from 0.05 wt % to 2 wt % of an acetylenic diol non-ionic surfactant; from 0.05 wt % to 2 wt % of a second surfactant. The second surfactant can be a polysorbate having at least 50% lipophilic oleic acid groups and having an HLB value of less than 15, or a C12-C18 polyoxyethylene glycol ether having an ethylene oxide number less than 20, or a perfluoropolyether including a polyethylene glycol primary alcohol or diol. The inkjet ink also includes from 5 wt % to 50 wt % of an organic solvent system comprising triethylene glycol and a cyclic amide.

Abstract: The present disclosure is drawn to a magenta pigment blend, a magenta ink, and a method of formulation a magenta pigment blend. The magenta pigment blend can be a first pigment including a solid solution of Pigment Violet 19 and Pigment Red 122, or Pigment Red 282; and a second pig-ment including Pigment Red 150. The weight ratio of the first pigment to the second pigment can be from 50:50 to 80:20 by pigment solids content.

Abstract: A fluid ejection structure can include thermal resistors, a substrate, layers on the substrate, wherein said layers can include a region proximate to the resistor that has reduced field oxide.

Abstract: The present disclosure is drawn to inkjet inks and related methods. The inkjet ink includes water, from 5 wt % to 50 wt % of an organic solvent system, from 2 wt % to 9 wt % pigment solids, from 0.1 wt % to 3 wt % polyurethane binder, and from 0.4 wt % to 1.5 wt % of an oleyl or stearyl type polyoxyethylene glycol ether surfactant.

Abstract: A fluid directing assembly can comprise a molded support comprising a modified epoxy molded compound which includes epoxy resin, cross-linker, filler, and is devoid of wax release agent. The assembly can also include a silicon die attached to the molded support and wherein the silicon die and the molded support define a fluid directing channel.

Abstract: An ink is disclosed. The ink composition includes an ink vehicle, a colorant, and a fluorosurfactant, wherein the fluorosurfactant is a polymer having the general formula: wherein p is any integer, q is any integer, Z1 and Z2 are each fluorine or any functional group, and R1, R2, R3 are each fluorine, any alkyl group, or any functional group, and wherein R1, R2, R3, Z1, and Z2 are not all fluorine and the fluorosurfactant lowers the surface tension of the ink vehicle. A method for improving a property of an ink is also disclosed.

Abstract: An ink is disclosed. The ink composition includes an ink vehicle, a colorant, and a fluorosurfactant, wherein the fluorosurfactant is a polymer having the general formula: wherein p is any integer, q is any integer, Z1 and Z2 are each fluorine or any functional group, and R1, R2, R3 are each fluorine, any alkyl group, or any functional group, and wherein R1, R2, R3, Z1, and Z2 are not all fluorine and the fluorosurfactant lowers the surface tension of the ink vehicle. A method for improving a property of an ink is also disclosed.

Abstract: In some embodiments, without limitation, a hydrophobic photoresist material and a method of making the photoresist material are provided. The photoresist material is derived by creating a high resolution insoluble, or more soluble, polymer structure as a result of a controlled chemical reaction with a functionalized perfluoropolyether. Also provided are methods of coating an inkjet printhead surface and processing the coated inkjet printhead surface.

Abstract: Methods of controllably ejecting liquid from a thermal inkjet printhead. A first pulse set sufficient to form a bubble to eject a drop of a liquid having a polymer phase dispersed in a colloidal suspension is applied to a firing resistor. The first pulse set forms a polymer residue on the firing resistor. After the first pulse set and before a collapse of the bubble, a second pulse insufficient to eject a drop of the liquid is applied to the firing resistor. The second pulse facilitates removal of at least a portion of the residue from the firing resistor.

Abstract: In some embodiments, without limitation, a hydrophobic photoresist material and a method of making the photoresist material are provided. The photoresist material is derived by creating a high resolution insoluble, or more soluble, polymer structure as a result of a controlled chemical reaction with a functionalized perfluoropolyether. Also provided are methods of coating an inkjet printhead surface and processing the coated inkjet printhead surface.