Dynamic non-component

[Builder Boy]

I wanted to use this with my pipe tool, but wasn't sure how. I guess that this is as good of a start as any:

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Try to scale the face along the red axis

[TIG]

I'm not sure what you're trying to achieve...
This might help [a bit] - it traps errors ..........

     class MyEntitiesObserver < Sketchup;;EntityObserver
       def onChangeEntity(entity)
           width = entity.bounds.width.to_f
           model = Sketchup.active_model
           entities = model.active_entities
           pts = []
           pts[0] = [0, 0, 0]
           pts[1] = [width, 0, 0]
           pts[2] = [width, width*2.0, 0]
           pts[3] = [0, width*2.0, 0]
          begin
           face = entities.add_face pts
           face.add_observer($mmmmmmmmmmmmmmmmmmmmm)
           entity.edges.each{|i| i.erase! if not e.edges[1]}
          rescue
           puts 'error'
           face.remove_observer($mmmmmmmmmmmmmmmmmmmmm)
           face.add_observer($mmmmmmmmmmmmmmmmmmmmm)
          end
       end
     end

 model = Sketchup.active_model
 entities = model.active_entities
 pts = []
 pts[0] = [0, 0, 0]
 pts[1] = [1, 0, 0]
 pts[2] = [1, 2, 0]
 pts[3] = [0, 2, 0]
 face = entities.add_face pts
$mmmmmmmmmmmmmmmmmmmmm=MyEntitiesObserver.new()
 face.add_observer($mmmmmmmmmmmmmmmmmmmmm)

I suggest you rename your observer as something less obvious... i.e. others might have used it !