Robotic automated storage and retrieval system mixed pallet build system

A pallet build system, comprising:

• a rack including two or more vertical levels upon which items are stored;
• and
• a three-dimensional robotic automated storage and retrieval system including
• a carriage upon which the items from the rack are loaded to create a build pallet,
• a vertical lift mechanism configured to move the carriage vertically between the vertical levels of the racks,
• a robot arm configured to palletize the items from the racks onto the pallet, and
• a mechanism on the carriage configured to progressively secure the palletized layers while the items are loaded onto the pallet.

A method, comprising:

• moving a three-dimensional robotic automated storage and retrieval system in a vertical direction to a first position;
• loading items from a rack at the first position onto the three-dimensional robotic automated storage and retrieval system;
• moving the three-dimensional robotic automated storage and retrieval system in a horizontal direction to a second position;
• and
• loading items from the rack at the second position onto the three-dimensional robotic automated storage and retrieval system.