Citing from the Nature publication:

"The shrinkage of the part during the sintering process is isotropic and dependent on the solid loading (hence can be ­calculated; see Supplementary Information). The sintering shrinkage for stereo- lithography and microstereolithography does not depend on the scale of the sintered parts (for example, the honeywell structure in Fig. 1a with a solid loading of 37.5 vol% showed the expected linear shrinkage of 27.88% in height from 3.05 mm to 2.2 mm and width from 2.177 cm to 1.57 cm)."

"During a final sintering step at 1,300 °C the density of the brown part is increased (ρ final = 2.2 g cm −3 ) to that of high-quality fused silica glass with no remaining porosity and no cracks."

But of course these processes could be quite sensitive to hard to control parameters.