Printers with orientable micro-mirrors

A printer, comprising:

• an energy source;
• an array of micro-mirrors;
• and
• a controller to control first micro-mirrors of the array of micro-mirrors to concurrently direct energy from the energy source toward a first fusing area in a powder bed to add first material to a solid portion of an item.

A printer, comprising:

• a light source to emit uncollimated light;
• a first array of micro-mirrors positioned to direct the uncollimated light toward a first portion of a powder bed, wherein at least one of a first distance from the light source to the first array of micro-mirrors, or a second distance from the first array of micro-mirrors to the powder bed is selected to control a first resolution of fusing areas in the first portion of the powder bed;
• and
• a second array of micro-mirrors positioned to direct the uncollimated light toward a second portion of the powder bed, wherein at least one of a third distance from the light source to the second array of micro-mirrors, or a fourth distance from the second array of micro-mirrors to the powder bed is selected to control a second resolution of fusing areas in the second portion of the powder bed.