A computing system for managing product customization is provided. The computing system includes instructions stored in memory and executable by a processor to receive, for each of a plurality of parts of a 3D product, a color selection input specifying a color selected by a user for that part, responsive to receiving the color selection inputs, generate a color histogram of the 3D product including a plurality of units, each unit being associated with one of the parts and assigned the color of that part, where the number of units allocated to each part is based on a size of the part, and display the color histogram in a graphical user interface.