@bjornburgh said:

Pasting the Script in the Ruby console doesn't work. Is there another way?

def remove_instances_duplicates defs=Sketchup.active_model.definitions to_delete=[] defs.each do |compo_def| next if compo_def.internal? instances=compo_def.instances instances2=instances instances2.each do |i2| keeping_instance=instances.shift instances.each do |instance| if instance != keeping_instance and instance.transformation.to_a == keeping_instance.transformation.to_a and instance.definition.insertion_point.transform(instance.transformation)==keeping_instance.definition.insertion_point.transform(keeping_instance.transformation) to_delete.push(instance) puts "Erasing duplicate instance of " + instance.definition.name end end end end to_delete.each { |inst| inst.erase! } end

There was an extra "end" in the code. Removing that should fix the problem.

After pasting into the Ruby Console, press Enter then type in "remove_instances_duplicates" to execute.