Systems, devices, and methods for 3d printing by harnessing deformation, instability, and fracture of viscoelastic inks

A three-dimensional printing system, comprising:

• a printhead having one or more nozzles;
• and
• a controller configured to operate the printhead to eject ink from the one or more nozzles towards a surface, the controller further being configured to print in a variety of different printing modes without changing hardware of the system, including hardware of the printhead and the one or more nozzles, the variety of different printing modes including accumulation, translating coiling, alternating coiling, stretching coiling, meandering, die-swelling, equi-dimensional, thinning, and discontinuous.

A three-dimensional printing system, comprising:

• a controller configured to select a printing mode based on at least one of a non-dimensional nozzle speed and a non-dimensional nozzle tip height in which the non-dimensional nozzle speed is based on both a nozzle speed and an extrusion speed, and the non-dimensional nozzle tip height is based on both a die-swollen diameter of material to be extruded from a nozzle and a combination of a height of a substrate configured to receive extruded material from the nozzle and a height of material disposed on the substrate;
• and
• one or more nozzles for depositing material based on a print mode selected by the controller.