The average shrinkage ratios for the slow- and fast-axes to the Z-axis were 1:1.37 and 1:2.74, respectively. These extreme differences can be attributed
to the layer-by-layer production method and binder burn-off. At 7608C, the apparent porosity reached a minimum of 0.36 percent, indicative of
asymptotic behavior that approaches a fully dense 3DP glass specimen. At low firing temperatures, the bulk density was similar to water, but increased
to a maximum of 2.41g/cm3. This indicates that 3DP recycled glass can behave similarly to common glass with accepted published bulk densities
ranging from 2.4-2.8g/cm3.