A custom build head was designed using Autodesk Fusion 360 and fabricated out of nylon using 3D printing (Markforged Mark II). A metal base plate was attached at the base of the build head using two wingnuts. The build head was attached to a commercially available linear screw actuator (Rattmmotor CBX1605-300A) to enable vertical motion. Motion was controlled using an on/off digital signal from a custom LabVIEW VI to start/stop a signal from a signal generator (Agilent 33220A).

Models were designed using DesignSpark Mechanical 2.0 or Autodesk Fusion 360 and exported as STL files. Image slices were created from STL files using the slicing feature in Autodesk Netfabb 2017. All models were sliced using a slice height of 25 μm to ensure a short slicing time while maintaining good feature resolution. During printing, image slices were displayed concurrently with movement of the build head using a LabVIEW VI (see fig. S5). Parts were rinsed with isopropanol after printing to remove uncured resin.

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