System and method for extruding parts having microstructures

A filament having microstructures comprising:

• a filament extruded through a die having a pre-cooled state and a pre-cooled microstructure;
• a plurality of microfeatures included in the pre-cooled microstructure in a radial spiral arrangement about a center that extends through each filament wherein the microfeatures each have a width in the range of 180 μm to 215 μm, height in the range of 170 μm to 180 μm, and short axis in the range of 390 μm to 410;
• and,
• the filament includes a post-cooled state having post-cooled microfeatures having physical dimensions smaller than that of the pre-cooled microfeatures wherein the post-cooled microfeatures include a center line that defines an angle Θ relative to a long axis that is less than 45°.

A fiber having microstructures comprising:

• a plurality of extruded filaments having pre-cooled microfeatures in a radial spiral arrangement about a center extending though the fiber wherein the pre-cooled microfeatures each have widths in the range of 5 μm to 400 μm and heights in the range of 25 μm to 400 μm;
• at least one filament having a post-cooled state having post-cooled microfeatures having physical dimensions smaller than that of the pre-cooled microfeatures wherein the post-cooled microfeatures include a center line that defines an angle Θ relative to a long axis that is less than 45°;
• and,
• wherein at least one filament is extruded through a die having a first arc disposed at a distal end of a die channel included in the die to produce the pre-cooled microstructures on the filament.