Forming a three dimensional object

A method of forming a three dimensional object, the method comprising:

• iteratively performing steps (i) to (iv) so as to form a three dimensional object comprising an electrically conductive track through at least part of the object, the electrically conductive track being defined by electrically conductive elements embedded within the object, wherein:
• step (i) comprises providing a layer of particulate material;
• step (ii) comprises providing an amount of a radiation absorbent material over a selected surface portion of the layer of particulate material;
• step (iii) comprises providing an amount of a material that comprises a plurality of electrically conductive elements over only part of the selected surface portion of the layer of particulate material;
• and
• step (iv) comprises providing radiation across the selected surface portion of the layer of particulate material so as to sinter a portion of the particulate material of the layer including causing the plurality of electrically conductive elements to become embedded in the portion of material and to sinter the portion of material with a previously sintered portion of the material in a prior layer;
• wherein
• the step of providing an amount of a material that comprises a plurality of electrically conductive elements comprises:
• providing a first non-zero level of the material that comprises a plurality of electrically conductive elements on a first area of the selected surface portion of the layer of particulate material;
• and
• providing a second non-zero level of the material that comprises a plurality of electrically conductive elements on a second area of the selected surface portion of the layer of particulate material, the second level being different to the first level.