There are a number of commands available that can be used to edit STL elements.
Duplicate: Create an exact copy of the STL element.
Scale: Enter a new size you want to scale the part to or specify a scaling factor along the X, Y, and Z-axes. If the
equal check box is enabled, the STL element is scaled by the same factor along all three axes. In this case, only the size of the element is changed. If the element is scaled unequally, the shape may change.
Rotate: Choose an axis around which the STL element is rotated. You can specify an angle of rotation or choose a standard angle.
Mirror: The STL element is mirrored in the direction of the chosen axis, across the plane of the other two axes.
Remove: Selected STL elements are removed from the cell.
Tip: You can also use the Delete key on your keyboard to remove elements.