This is just a simplified shape of a standard servo motor. It includes the cutout shape so you can easily include it in your own model.Download the .jscad file and copy the servoMotor() function in your own model. An online interactive version is here: http://joostn.github.com/OpenJsCad/ (scroll down to Examples and choose Servo Motor) This demo merely serves to show how to use properties and connectors in OpenJsCad. The servo motor library function not only returns the shape of the servo motor, but it also defines a 'cutout shape' property and a connector property. The cutout shape can be subtracted from another solid, to make holes for the servo motor itself and for the screw holes. The connector property makes it easy to align the servo motor to a surface, without knowing the actual orientation or dimensions of the servo. Whenever the object is transformed (i.e. rotated, scaled or translated), the properties are transformed with it. So you can rotate and move the servo motor as you like and still have the correct cutout shape. For details see the documentation at http://joostn.github.com/OpenJsCad/