Sorry for the delayed response. It looks fine, thanks again!

Yeah, you're right, but I meant black lines in rectangular blocks (rather, all lines).

It seems that it works too. Thanks!
But black lines are still there.
You have there "]", I think, it should be "}"?

It seems that it works. Is it correct way?
Just one question, how can I delete the black lines?, or hide them.

def drill(x, y, z, radiuses, depths, directions)
	model = Sketchup.active_model 
	countOfDrills = x.length.to_i
	countOfDrills.times do |i|
		
		center = [x[i], y[i], z[i]].map(&;to_f)		
		radius = radiuses[i]
		depth = depths[i]
		direction = directions[i]
		
		case direction
			when "N"
				dir = Geom;;Vector3d.new(0,0,1)
			when "E"
				dir = Geom;;Vector3d.new(-1,0,0)
			when "S"
				dir = Geom;;Vector3d.new(0,0,-1)
			when "W"
				dir = Geom;;Vector3d.new(1,0,0)		
			when "F"
				dir = Geom;;Vector3d.new(0,-1,0)	
			when "B"
				dir = Geom;;Vector3d.new(0,1,0)				
			else
				dir = Geom;;Vector3d.new(0,0,1)		
		end		
		
		groups = []
		i = 0
		Sketchup.active_model.entities.each{|g|
			next unless g.is_a?(Sketchup;;Group)
			g.entities.each{|f|
				next unless f.is_a?(Sketchup;;Face)
				if center.on_plane? f.plane then
					groups.each {|x| next if g == x}
					groups[i] = g
					i += 1
				end
			}	
		}	
		
		groups = groups.uniq
		
		countOfGroups = groups.length.to_i
		countOfGroups.times do |i|
			group = groups[i]
			gents = group.entities
			activeFaces = gents.grep(Sketchup;;Face)
			circleGroup = gents.add_group; cge = circleGroup.entities
			edges = cge.add_circle(center, dir, radius)
			circleGroup.explode
			circleFace = (gents.grep(Sketchup;;Face) - activeFaces).last
			next if circleFace == nil
			normal = circleFace.normal
			activeFaces = gents.grep(Sketchup;;Face)
			circleFace.pushpull(-depth)
			deleteFace = (gents.grep(Sketchup;;Face) - activeFaces)[0]
			if deleteFace.normal == normal then
				deleteFace.erase!	
			end
		end
	end
end

No, they aren't. I know it's a problem and if I will do drill into 2 blocks, they need to be in the same group. But for now, the problem is first image. It looks like, pushpull tools pushpull the block and not cylinder(drill/notch).

It works!! I had a little bug in my input file.
So final code is

		group = nil
		Sketchup.active_model.entities.each{|g|
			next unless g.is_a?(Sketchup;;Group)
			g.entities.each{|f|
				next unless f.is_a?(Sketchup;;Face)
				if center.on_plane? f.plane then
					group = g
				end
			}	
		}	
		gents = group.entities
		active_faces = gents.grep(Sketchup;;Face)
		circle_group = gents.add_group; cge = circle_group.entities
		edges = cge.add_circle(center, dir, radius)
		circle_group.explode
		circle_face = (gents.grep(Sketchup;;Face) - active_faces)[0]
		circle_face.pushpull(-depth)	
		togos = [] 
		edges.each{|edge| togos << edge unless edge.faces[0] }
		model.active_entities.erase_entities(togos) if togos[0]	

Many many many thanks to both!
Maybe a question about the second image, is it possible do it somehow?
i.e.: Even if they are 4 blocks next to each (2x2 matrix) and create a hole in the middle.
It occurred to me, try to apply this method twice (or more, if there will be more blocks next to each other).
Or maybe 2nd solution, make a temporary group with all common groups/faces where will be a hole.

Edit:
So, I edited it

		groups = []
		i = 0
		Sketchup.active_model.entities.each{|g|
			next unless g.is_a?(Sketchup;;Group)
			g.entities.each{|f|
				next unless f.is_a?(Sketchup;;Face)
				if center.on_plane? f.plane then
					groups.each {|x| next if g == x}
					groups[i] = g
					i += 1
				end
			}	
		}	
		
		groups = groups.uniq
				
		countOfGroups = groups.length.to_i
		countOfGroups.times do |i|
			group = groups[i]
			gents = group.entities
			active_faces = gents.grep(Sketchup;;Face)
			circle_group = gents.add_group; cge = circle_group.entities
			edges = cge.add_circle(center, dir, radius)
			circle_group.explode
			circle_face = (gents.grep(Sketchup;;Face) - active_faces)[0]
			next if circle_face == nil
			circle_face.pushpull(-depth)	
			togos = [] 
			edges.each{|edge| togos << edge unless edge.faces[0] }
			model.active_entities.erase_entities(togos) if togos[0]		
		end

It "works", but there is a problem, if I need do a drill over 3 (more) blocks.
Or when I have 4 blocks, etc..

I found that after this circle_face = (gents.grep(Sketchup::Face) - active_faces), there are two faces, so I tried ".last", it helped, but still don't work at well.

Aby ideas?

It almost works, but the result is

def notch(x, y, z, radiuses, depths, directions)
	model = Sketchup.active_model 
	countOfNotch = x.length.to_i
	countOfNotch.times do |i|
		
		center = [x[i], y[i], z[i]].map(&;to_f)		
		radius = radiuses[i]
		depth = depths[i]
		direction = directions[i]
		
		case direction
			when "N"
				dir = Geom;;Vector3d.new(0,0,1)
			when "E"
				dir = Geom;;Vector3d.new(-1,0,0)
			when "S"
				dir = Geom;;Vector3d.new(0,0,-1)
			when "W"
				dir = Geom;;Vector3d.new(1,0,0)		
			when "F"
				dir = Geom;;Vector3d.new(0,-1,0)	
			when "B"
				dir = Geom;;Vector3d.new(0,1,0)				
			else
				dir = Geom;;Vector3d.new(0,0,1)		
		end		
		
		group = nil
		Sketchup.active_model.entities.each{|g|
			next unless g.is_a?(Sketchup;;Group)
			g.entities.each{|f|
				next unless f.is_a?(Sketchup;;Face)
				if center.on_plane? f.plane then
					group = g
				end
			}	
		}	
		gents = group.entities
		active_faces = gents.grep(Sketchup;;Face);
		circle_group = gents.add_group; cge = circle_group.entities;
		edges = cge.add_circle(center, dir, radius);
		circle_group.explode;
		circle_face = (gents.grep(Sketchup;;Face) - active_faces)[0];
		circle_face.pushpull(-depth)		
	end
end

It works only if the cylinder's face is whole on the block.

It "works", if I have two blocks on each other

So there are 2 solutions for this (I think)

1. save somewhere the group where will be notch
2. find that group somehow
   because, when I do a dril, I'm using this

		group = nil
		face = nil
		Sketchup.active_model.entities.each{|g|
			next unless g.is_a?(Sketchup;;Group)
			g.entities.each{|f|
				next unless f.is_a?(Sketchup;;Face)
				if f.classify_point(center) == Sketchup;;Face;;PointInside then
					group = g
					face = f
				end
			}	
		}

2.) Exist a way how to find "my" group, where is the rectangular block, when the center point is outside that block?

Hmm, I have one main method, one method for rectangle blocks and next method for cylinders, but in every of those methods I have
group = Sketchup.active_model.active_entities.add_group() entities = group.entities
so then i.e.
circle = entities.add_circle(center, dir, radius)
or
entities.add_line(ptA, ptB) etc bottom = entities.add_face(ptA, ptB, ptC, ptD)
So this is the wrong solution?
If I understand correctly, I need have group = Sketchup.active_model.active_entities.add_group() only in main method and then passed as a variable to other methods?

I had never defined the group in this method previous.
This is what I have now:

def notch(x, y, z, radiuses, depths, directions)
	model = Sketchup.active_model 
	countOfNotch = x.length.to_i
	countOfNotch.times do |i|
		
		center = [x[i], y[i], z[i]].map(&;to_f)		
		radius = radiuses[i]
		depth = depths[i]
		direction = directions[i]
		
		case direction
			when "N"
				dir = Geom;;Vector3d.new(0,0,1)
			when "E"
				dir = Geom;;Vector3d.new(-1,0,0)
			when "S"
				dir = Geom;;Vector3d.new(0,0,-1)
			when "W"
				dir = Geom;;Vector3d.new(1,0,0)		
			when "F"
				dir = Geom;;Vector3d.new(0,-1,0)	
			when "B"
				dir = Geom;;Vector3d.new(0,1,0)				
			else
				dir = Geom;;Vector3d.new(0,0,1)		
		end		
		
		gents = group.entities
		active_faces = gents.grep(Sketchup;;Face);### modified
		circle_group = gents.add_group; cge = circle_group.entities;### new
		edges = cge.add_circle(center, dir, radius);### modified
		circle_group.explode;### new
		circle_face = (gents.grep(Sketchup;;Face) - active_faces)[0];### modified	
		circle_face.pushpull(-depth)		
	end
end

Of cource, I define a group in method, where I draw a rectangel block, but it's independently. So first I call this method, it'll draw several blocks, and then, if is necessary (according to input file) I'll call a method for notch.

I am slightly confused now because before you said

@unknownuser said:

You don't need to add the edges to a new group.
raw it directly over the face in the active_entities.
edges = Sketchup.active_model.active_entities.add_circle(center, dir, radius, segs)

So what should I do?
If I understood Sam correctly, I need sth like
group = Sketchup.active_model.active_entities.add_group() gents = group.entities active_faces = model.active_entities.grep(Sketchup::Face) edges = gents.add_circle(center, dir, radius) group.explode circle_face = model.active_entities.grep(Sketchup::Face) - active_faces
.. and then?
I'm not sure what is meant by "add a group inside the original group".

By the way, thanks Sam, or, thanks to both.