Investigation into the shape fidelity of the PEGDA + Alg platform was conducted next, using negative and positive features. For negative shape fidelity, a block with rectilinear channels decreasing in increments of 50 μm was used. Shown in Figure , the minimum negative feature seen with these materials was variable based on content. The printing of negative structures is especially sensitive to printing conditions, as under-polymerization will result in larger channels than designed, while over-polymerization will reduce channel size until eventual closure. With the input STL design set to 200 μm channels, we saw resulting channel sizes of 467 ± 33 μm, 212 ± 21 μm, and 263 ± 50 μm for 5% PEGDA + Alg, 10% PEGDA + Alg, and 15% PEGDA + Alg, respectively. The increase in negative feature size between 10% PEGDA + Alg and 15% PEGDA + Alg is attributed to the increase in opacity upon polymerization seen, which leads to a decrease in final received dose in the center of parts on the 15% PEGDA + Alg. To the best of our knowledge, no other reports exist of PEGDA VAM structures with <250um negative space resolution, previous work by Falandt et al. has shown similar results with input and output in negative resolution space using gelatin based resins . A positive feature test was designed which evaluated the minimum positive feature size of a five-sided star shape, which is shown printing in Supporting Video 3. As shown in Figure , the minimal positive feature size of the respective photopolymer was inversely related to polymer content, ranging from 56 ± 9 μm for 5% PEGDA + Alg, to 47 ± 12 μm for 10% PEGDA + Alg, and 38 ± 7 μm for 15% PEGDA + Alg.