The subject disclosure is directed towards technology managing three-dimensional object fabrication in full color. In order to transform the object's model into an instruction set for a fabrication device, a fabrication manager computes color values corresponding to geometry within a later of the object's model. After determining an amount of each colored material to deposit, the fabrication manager generates coordinated instructions configured to deposit a combination of colored materials according to the geometry and efficiently transitioning between colored materials during object fabrication.