MakerBot Print is our newest print-prepration software, which supports native CAD files and STL assemblies,
allows you to interact with all your printers via the Cloud, and many other exciting new features.
please change the part variable to lid_leftknurled. For other valid values please refer the comment:
part = "container"; // [container:Container,lid_leftknurled:Lid - Left Knurled, lid_rightknurled:Lid - Right Knurled, lid_verticalknurled: Lid - Vertical Knurled, lid_doubleknurled:Lid - Double Knurled, lid_simple_nonknurled:Lid - Simple Non Knurled]