Build material distributing cylinders

An additive manufacturing system, comprising:

• a build platform;
• a build material supply system;
• and
• a roller, comprising:
• a first cylinder comprising a first plurality of holes defined therein;
• a second cylinder interior and coaxial to the first cylinder comprising a second plurality of holes open to an interior of the first cylinder;
• a third cylinder interior to the first cylinder and exterior to the second cylinder, the third cylinder comprising a longitudinal cutout open to the first cylinder;
• wherein the build material supply system delivers build material into an interior cavity of the second cylinder via a supply tube.

A roller for a three-dimensional additive manufacturing system, comprising:

• a replaceable first cylinder comprising a first plurality of holes defined therein;
• a second cylinder interior and coaxial to the first cylinder comprising a second plurality of holes open to an interior of the first cylinder;
• a third cylinder interior to the first cylinder and exterior to the second cylinder, the third cylinder comprising a first longitudinal cutout open to the first cylinder wherein an edge of the longitudinal cutout is placed in a second quarter relative to the first cylinder;
• and
• a fourth cylinder comprising a fourth plurality of holes defined therein wherein the fourth cylinder is interior to and coaxial with the first cylinder and exterior to the third cylinder, the fourth cylinder comprising a third plurality of holes;
• wherein the build material supply system delivers build material into an interior cavity of the second cylinder via a supply tube.