The technology disclosed herein generally relates to methods of making a spacer. At least a portion of a first elongate strip and a portion of a second elongate strip are arranged to define a space there between. A first sidewall is extruded through a first extrusion nozzle in the space. The first sidewall is adhered to the first elongate strip and the second elongate strip and the first extrusion nozzle is moved relative to the first and second elongate strips while extruding the first sidewall.