Three-dimensional printing device for printing polyurethane articles

A method of 3D printing a polyurethane article comprising:

• introducing, using a first gear pump, a first polyurethane reagent into a mixing chamber of a travelling dispenser, the first polyurethane reagent comprising a polyol mixture;
• introducing, using a second gear pump, a second polyurethane reagent into the mixing chamber of the travelling dispenser, the second polyurethane reagent comprising a diisocyanate;
• and
• operating a rotor housed in the mixing chamber to mix the first polyurethane reagent and the second polyurethane reagent in the mixing chamber to form a polyurethane reagent mixture and extrude the polyurethane reagent mixture out of a nozzle onto a substrate, the extruded polyurethane reagent mixture forming at least a portion of the polyurethane article.