Extended Data Fig. 1: Scanning electron microscope (SEM) images and photographs of MM3D printheads with varying numbers of nozzles and materials.
From: Voxelated soft matter via multimaterial multinozzle 3D printing

a, SEM images (top–down view) of 0D (1 × 1), 1D (8 × 1) and 2D (4 × 4; 16 × 8) nozzle arrays for two-material MM3D printing. b, Higher-magnification SEM images of these printheads, showing an individual nozzle outlet (tilted and top–down views). Scale bar, 200 µm. c, SEM images (tilted views) of 4 × 4 and 16 × 8 two-material MM3D printheads. d, Photographs of MM3D printheads showing N = 1 × 1, 8 × 1, 4 × 4 and 16 × 8 designs, which increase from 1 to 128 nozzles per printhead (from left to right), where Sink = 2. e, Photographs showing side (top row) and top (bottom row) views of MM3D printheads with an increasing number of materials being delivered to each nozzle, where N = 8 × 1. Scale bars, 5 mm.