Hewlett-packard Development Company, L.p.

Anthony William McLennan

Omer Gila

Seongsik Chang

Lihua Zhao

Thomas C Anthony

Kristopher J Erickson

Daniel Espinosa

Zhang-Lin Zhou

Krzysztof Nauka

Michael H Lee

Eric G Nelson

Bruce J Jackson

Asaf Anufa

Michael Anthony Lee

Brad Thomas Dransfield

Eyal Lovton

Asael Degany

An example system includes a three-dimensional (3D) printer to generate a 3D object and a surface feature formation arrangement to receive the 3D object. The 3D object has at least one surface with a layer of at least partly uncured material. The surface feature formation arrangement includes a controller and a heat source. The controller is to operate the heat source to selectively apply heat to the at least one surface of the 3D object. The heat from the heat source is to transform the at least partly uncured material to form a selected feature on the at least one surface.

Surface feature formation for three-dimensional printing

Example post-print processing of three dimensional (3D) printed objects are disclosed. An example system includes an energy source to apply energy to a selected portion of an outer surface of a 3D printed object. The energy provided by the energy source is to cause a polymer of the selected portion to melt and reflow. The selected portion and a non-selected portion of the outer surface to form a pattern on the outer surface of the 3D printed object. A controller to direct the energy of the energy source to the selected portion of the outer surface.

Post-print processing of three dimensional (3D) printed objects

An electrophotographic printer includes a charge roller in charge-transferring relation to a photoconductive imaging portion. The printer may determine an AC voltage setpoint of the charge roller.

Charge roller voltage determination

A device includes a charge roller and a control portion. The charge roller is removably insertable to be in charge-transferring relation to, and spaced apart by a first air gap from, a photoconductive imaging portion of an electrophotographic printer. The control portion is to determine a size of the first air gap based on determination of a charging threshold voltage associated with the charge roller.

Charge roller gap determination

A charge roller includes a body having a metal external surface and an inorganic outer resistive coating.

Charge roller for electrographic printer

An organic photoconductor includes a conductive substrate; a charge generation layer over the conductive substrate; a charge transport layer over the charge generation layer; and an overcoat layer over the charge transport layer. The overcoat layer comprises a cross-linked polyacrylate that includes a charge transport material dispersed therein and a polyhedral oligomeric silsesquioxane.

Organic photoconductor coating

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Palo Alto, CA, United States of America

Anthony William McLennan