A method is provided. The method includes preparing a surface to receive a 3D printed layer, 3D printing a conductive layer comprising a plurality of overlaid layers of conductive material to the surface, and 3D printing conductive diamonds to the conductive layer. Preparing the surface includes one or more of texturing the surface and chemically treating the surface. The texturing is performed in order to not adversely impact regularity of the surface and limit variations in the height from the surface of conductive diamonds. Chemically treating the surface reduces films or coatings that may impact adhesion between the surface and the conductive layer, without degrading the conductive layer.

A particulate build material for three-dimensional printing can include from about 80 wt % to about 99.5 wt % of a polyamide particles, and from about 0.5 w % to about 7.5 wt % of thermally conductive particles including cubic lattice structured particles of carbon, cubic lattice structured particles of boron and nitrogen, or a combination thereof.

A particulate build material for three-dimensional printing can include from about 80 wt % to about 99.5 wt % of a polyamide particles, and from about 0.5 w % to about 7.5 wt % of thermally conductive particles including cubic lattice structured particles of carbon, cubic lattice structured particles of boron and nitrogen, or a combination thereof.

Three-dimensional printing kits can include a powder bed material and a fusing agent to selectively apply to the powder bed material. The powder bed material can include polymer build particles and cellulose particles. The cellulose particles can be chemically and thermally stable at a melting point temperature of the polymer build particles. The fusing agent can include water and a radiation absorber to absorb radiation energy and convert the radiation energy to heat.

A method for preparing a flexible sol-gel polishing block, the method comprises: (1) adding a gel agent and a 20 m diamond abrasive into deionized water, and stirring to even to obtain a first material; (2) adding carbon fiber into the first material obtained in the step 1, and mixing to even to obtain a second material; (3) injecting the second material obtained in the step 2 into a mold, and curing to obtain a cured gel; and (4) drying the cured gel to obtain the flexible sol-gel polishing block.