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Diagrams showing the working mechanisms of micro-extrusion and DLP printers. (A) A micro-extrusion printer with examples of different extrusion nozzles and drivers (mechanical, pneumatic) along with the build platform [20]. (B) A DLP printer showing the orientations of the light source, curing plane, fabricated object, and build plate. Reprinted with the permission from Ref. [20]. Copyright 2018 AIP Publishing.
