diff --git a/circular_saw.lua b/circular_saw.lua
index e60ddb0..dcf4e82 100644
--- a/circular_saw.lua
+++ b/circular_saw.lua
@@ -29,17 +29,6 @@ circular_saw.known_nodes = {}
 -- This is populated by stairsplus:register_micro:
 circular_saw.microblocks = {}
 
--- How many microblocks does this shape at the output inventory cost:
--- It may cause slight loss, but no gain.
-circular_saw.cost_in_microblocks = {
-	1, 1, 1, 1, 1, 1, 1, 2,
-	2, 3, 2, 4, 2, 4, 5, 6,
-	7, 1, 1, 2, 4, 6, 7, 8,
-	1, 2, 2, 3, 1, 1, 2, 4,
-	4, 2, 6, 7, 3, 7, 7, 4,
-	8, 3, 2, 6, 2, 1, 3, 4
-}
-
 circular_saw.names = {
 	{"micro", "_1"},
 	{"panel", "_1"},
@@ -96,11 +85,13 @@ circular_saw.names = {
 	{"slope", "_cut"},
 }
 
+-- How many microblocks does this shape at the output inventory cost:
+-- It may cause slight loss, but no gain.
 function circular_saw:get_cost(inv, stackname)
 	local name = minetest.registered_aliases[stackname] or stackname
 	for i, item in pairs(inv:get_list("output")) do
 		if item:get_name() == name then
-			return circular_saw.cost_in_microblocks[i]
+			return item:get_definition()._circular_saw_cost
 		end
 	end
 end
@@ -118,10 +109,11 @@ function circular_saw:get_output_inv(modname, material, amount, max)
 
 	for i = 1, #circular_saw.names do
 		local t = circular_saw.names[i]
-		local cost = circular_saw.cost_in_microblocks[i]
-		local balance = math.min(math.floor(amount/cost), max)
 		local nodename = modname .. ":" .. t[1] .. "_" .. material .. t[2]
-		if  minetest.registered_nodes[nodename] then
+		local def = minetest.registered_nodes[nodename]
+		if def then
+			local cost = def._circular_saw_cost
+			local balance = math.min(math.floor(amount/cost), max)
 			pos = pos + 1
 			list[pos] = nodename .. " " .. balance
 		end
@@ -358,8 +350,9 @@ function circular_saw.on_metadata_inventory_take(
 	-- If it is one of the offered stairs: find out how many
 	-- microblocks have to be subtracted:
 	if listname == "output" then
+		local def = stack:get_definition()
 		-- We do know how much each block at each position costs:
-		local cost = circular_saw.cost_in_microblocks[index]
+		local cost = def._circular_saw_cost
 				* stack:get_count()
 		circular_saw:update_inventory(pos, -cost)
 	elseif listname == "micro" then
diff --git a/stairsplus/API.md b/stairsplus/API.md
index 46b838d..9a9a4d7 100644
--- a/stairsplus/API.md
+++ b/stairsplus/API.md
@@ -9,7 +9,7 @@
 	stairsplus:register_all("moreblocks", "wood", "default:wood", {
 		description = "Wooden",
 		tiles = {"default_wood.png"},
-		groups = {oddly_breakabe_by_hand=1},
+		groups = {oddly_breakable_by_hand=1},
 		sounds = moreblocks.node_sound_wood_defaults(),
 	})
 	```
diff --git a/stairsplus/common.lua b/stairsplus/common.lua
index c17b1cc..fb1723b 100644
--- a/stairsplus/common.lua
+++ b/stairsplus/common.lua
@@ -157,17 +157,17 @@ stairsplus.register_single = function(category, alternate, info, modname, subnam
 		else
 			def.on_place = stairsplus.rotate_node_aux
 		end
-		if type(info) ~= "table" then
+		if info._circular_saw_cost then
+			def._circular_saw_cost = info._circular_saw_cost
+		end
+		if info.size then
 			def.node_box = {
 				type = "fixed",
-				fixed = {-0.5, -0.5, -0.5, 0.5, (info/16)-0.5, 0.5},
+				fixed = {-0.5, -0.5, -0.5, 0.5, (info.size/16)-0.5, 0.5},
 			}
-			def.description = ("%s (%d/16)"):format(desc_base, info)
+			def.description = ("%s (%d/16)"):format(desc_base, info.size)
 		else
-			def.node_box = {
-				type = "fixed",
-				fixed = info,
-			}
+			def.node_box = info.node_box
 			def.description = desc_base .. alternate:gsub("_", " "):gsub("(%a)(%S*)", function(a, b) return a:upper() .. b end)
 		end
 	else
diff --git a/stairsplus/defs.lua b/stairsplus/defs.lua
index 893ec68..934822a 100644
--- a/stairsplus/defs.lua
+++ b/stairsplus/defs.lua
@@ -112,42 +112,49 @@ local box_slope_outer_half_raised = {
 stairsplus.defs = {
 	["micro"] = {
 		[""] = {
+			_circular_saw_cost = 1,
 			node_box = {
 				type = "fixed",
 				fixed = {-0.5, -0.5, 0, 0, 0, 0.5},
 			},
 		},
 		["_1"] = {
+			_circular_saw_cost = 1,
 			node_box = {
 				type = "fixed",
 				fixed = {-0.5, -0.5, 0, 0, -0.4375, 0.5},
 			},
 		},
 		["_2"] = {
+			_circular_saw_cost = 1,
 			node_box = {
 				type = "fixed",
 				fixed = {-0.5, -0.5, 0, 0, -0.375, 0.5},
 			},
 		},
 		["_4"] = {
+			_circular_saw_cost = 1,
 			node_box = {
 				type = "fixed",
 				fixed = {-0.5, -0.5, 0, 0, -0.25, 0.5},
 			},
 		},
 		["_12"] = {
+			_circular_saw_cost = 2,
 			node_box = {
 				type = "fixed",
 				fixed = {-0.5, -0.5, 0, 0, 0.25, 0.5},
 			},
 		},
 		["_14"] = {
+			_circular_saw_cost = 2,
 			node_box = {
 				type = "fixed",
 				fixed = {-0.5, -0.5, 0, 0, 0.375, 0.5},
 			},
 		},
 		["_15"] = {
+			_circular_saw_cost = 2,
 			node_box = {
 				type = "fixed",
 				fixed = {-0.5, -0.5, 0, 0, 0.4375, 0.5},
@@ -156,42 +163,49 @@ stairsplus.defs = {
 	},
 	["panel"] = {
 		[""] = {
+			_circular_saw_cost = 2,
 			node_box = {
 				type = "fixed",
 				fixed = {-0.5, -0.5, 0, 0.5, 0, 0.5},
 			},
 		},
 		["_1"] = {
+			_circular_saw_cost = 1,
 			node_box = {
 				type = "fixed",
 				fixed = {-0.5, -0.5, 0, 0.5, -0.4375, 0.5},
 			},
 		},
 		["_2"] = {
+			_circular_saw_cost = 1,
 			node_box = {
 				type = "fixed",
 				fixed = {-0.5, -0.5, 0, 0.5, -0.375, 0.5},
 			},
 		},
 		["_4"] = {
+			_circular_saw_cost = 1,
 			node_box = {
 				type = "fixed",
 				fixed = {-0.5, -0.5, 0, 0.5, -0.25, 0.5},
 			},
 		},
 		["_12"] = {
+			_circular_saw_cost = 3,
 			node_box = {
 				type = "fixed",
 				fixed = {-0.5, -0.5, 0, 0.5, 0.25, 0.5},
 			},
 		},
 		["_14"] = {
+			_circular_saw_cost = 4,
 			node_box = {
 				type = "fixed",
 				fixed = {-0.5, -0.5, 0, 0.5, 0.375, 0.5},
 			},
 		},
 		["_15"] = {
+			_circular_saw_cost = 4,
 			node_box = {
 				type = "fixed",
 				fixed = {-0.5, -0.5, 0, 0.5, 0.4375, 0.5},
@@ -199,41 +213,83 @@ stairsplus.defs = {
 		}
 	},
 	["slab"] = {
-		[""] = 8,
-		["_quarter"] = 4,
-		["_three_quarter"] = 12,
-		["_1"] = 1,
-		["_2"] = 2,
-		["_14"] = 14,
-		["_15"] = 15,
+		[""] = {
+			_circular_saw_cost = 4,
+			size = 8
+		},
+		["_quarter"] = {
+			_circular_saw_cost = 2,
+			size = 4
+		},
+		["_three_quarter"] = {
+			_circular_saw_cost = 6,
+			size = 12
+		},
+		["_1"] = {
+			_circular_saw_cost = 1,
+			size = 1
+		},
+		["_2"] = {
+			_circular_saw_cost = 1,
+			size = 2
+		},
+		["_14"] = {
+			_circular_saw_cost = 7,
+			size = 14
+		},
+		["_15"] = {
+			_circular_saw_cost = 8,
+			size = 15;
+		},
 		["_two_sides"] = {
-			{ -0.5, -0.5, -0.5, 0.5, -7/16, 7/16 },
-			{ -0.5, -0.5, 7/16, 0.5, 0.5, 0.5 }
+			_circular_saw_cost = 1,
+			node_box = {
+				type = "fixed",
+				fixed = {
+					{ -0.5, -0.5, -0.5, 0.5, -7/16, 7/16 },
+					{ -0.5, -0.5, 7/16, 0.5, 0.5, 0.5 }
+				}
+			};
 		},
 		["_three_sides"] = {
-			{ -7/16, -0.5, -0.5, 0.5, -7/16, 7/16 },
-			{ -7/16, -0.5, 7/16, 0.5, 0.5, 0.5 },
-			{ -0.5, -0.5, -0.5, -7/16, 0.5, 0.5 }
+			_circular_saw_cost = 2,
+			node_box = {
+				type = "fixed",
+				fixed = {
+					{ -7/16, -0.5, -0.5, 0.5, -7/16, 7/16 },
+					{ -7/16, -0.5, 7/16, 0.5, 0.5, 0.5 },
+					{ -0.5, -0.5, -0.5, -7/16, 0.5, 0.5 }
+				}
+			}
 		},
 		["_three_sides_u"] = {
-			{ -0.5, -0.5, -0.5, 0.5, 0.5, -7/16 },
-			{ -0.5, -0.5, -7/16, 0.5, -7/16, 7/16 },
-			{ -0.5, -0.5, 7/16, 0.5, 0.5, 0.5 }
+			_circular_saw_cost = 2,
+			node_box = {
+				type = "fixed",
+				fixed = {
+					{ -0.5, -0.5, -0.5, 0.5, 0.5, -7/16 },
+					{ -0.5, -0.5, -7/16, 0.5, -7/16, 7/16 },
+					{ -0.5, -0.5, 7/16, 0.5, 0.5, 0.5 }
+				}
+			}
 		}
 	},
 	["slope"] = {
 		[""] = {
+			_circular_saw_cost = 4,
 			mesh = "moreblocks_slope.obj",
 			collision_box = box_slope,
 			selection_box = box_slope,
 
 		},
 		["_half"] = {
+			_circular_saw_cost = 2,
 			mesh = "moreblocks_slope_half.obj",
 			collision_box = box_slope_half,
 			selection_box = box_slope_half,
 		},
 		["_half_raised"] = {
+			_circular_saw_cost = 6,
 			mesh = "moreblocks_slope_half_raised.obj",
 			collision_box = box_slope_half_raised,
 			selection_box = box_slope_half_raised,
@@ -242,16 +298,19 @@ stairsplus.defs = {
 		--==============================================================
 
 		["_inner"] = {
+			_circular_saw_cost = 7,
 			mesh = "moreblocks_slope_inner.obj",
 			collision_box = box_slope_inner,
 			selection_box = box_slope_inner,
 		},
 		["_inner_half"] = {
+			_circular_saw_cost = 3,
 			mesh = "moreblocks_slope_inner_half.obj",
 			collision_box = box_slope_inner_half,
 			selection_box = box_slope_inner_half,
 		},
 		["_inner_half_raised"] = {
+			_circular_saw_cost = 7,
 			mesh = "moreblocks_slope_inner_half_raised.obj",
 			collision_box = box_slope_inner_half_raised,
 			selection_box = box_slope_inner_half_raised,
@@ -260,16 +319,19 @@ stairsplus.defs = {
 		--==============================================================
 
 		["_inner_cut"] = {
+			_circular_saw_cost = 7,
 			mesh = "moreblocks_slope_inner_cut.obj",
 			collision_box = box_slope_inner,
 			selection_box = box_slope_inner,
 		},
 		["_inner_cut_half"] = {
+			_circular_saw_cost = 4,
 			mesh = "moreblocks_slope_inner_cut_half.obj",
 			collision_box = box_slope_inner_half,
 			selection_box = box_slope_inner_half,
 		},
 		["_inner_cut_half_raised"] = {
+			_circular_saw_cost = 8,
 			mesh = "moreblocks_slope_inner_cut_half_raised.obj",
 			collision_box = box_slope_inner_half_raised,
 			selection_box = box_slope_inner_half_raised,
@@ -278,16 +340,19 @@ stairsplus.defs = {
 		--==============================================================
 
 		["_outer"] = {
+			_circular_saw_cost = 3,
 			mesh = "moreblocks_slope_outer.obj",
 			collision_box = box_slope_outer,
 			selection_box = box_slope_outer,
 		},
 		["_outer_half"] = {
+			_circular_saw_cost = 2,
 			mesh = "moreblocks_slope_outer_half.obj",
 			collision_box = box_slope_outer_half,
 			selection_box = box_slope_outer_half,
 		},
 		["_outer_half_raised"] = {
+			_circular_saw_cost = 6,
 			mesh = "moreblocks_slope_outer_half_raised.obj",
 			collision_box = box_slope_outer_half_raised,
 			selection_box = box_slope_outer_half_raised,
@@ -296,21 +361,25 @@ stairsplus.defs = {
 		--==============================================================
 
 		["_outer_cut"] = {
+			_circular_saw_cost = 2,
 			mesh = "moreblocks_slope_outer_cut.obj",
 			collision_box = box_slope_outer,
 			selection_box = box_slope_outer,
 		},
 		["_outer_cut_half"] = {
+			_circular_saw_cost = 1,
 			mesh = "moreblocks_slope_outer_cut_half.obj",
 			collision_box = box_slope_outer_half,
 			selection_box = box_slope_outer_half,
 		},
 		["_outer_cut_half_raised"] = {
+			_circular_saw_cost = 3,
 			mesh = "moreblocks_slope_outer_cut_half_raised.obj",
 			collision_box = box_slope_outer_half_raised,
 			selection_box = box_slope_outer_half_raised,
 		},
 		["_cut"] = {
+			_circular_saw_cost = 4,
 			mesh = "moreblocks_slope_cut.obj",
 			collision_box = box_slope_outer,
 			selection_box = box_slope_outer,
@@ -318,6 +387,7 @@ stairsplus.defs = {
 	},
 	["stair"] = {
 		[""] = {
+			_circular_saw_cost = 6,
 			node_box = {
 				type = "fixed",
 				fixed = {
@@ -327,6 +397,7 @@ stairsplus.defs = {
 			},
 		},
 		["_half"] = {
+			_circular_saw_cost = 3,
 			node_box = {
 				type = "fixed",
 				fixed = {
@@ -335,6 +406,7 @@ stairsplus.defs = {
 				},
 			},
 		},
+		-- TODO FIXME not included in circular_saw.names
 		["_right_half"] = {
 			node_box = {
 				type = "fixed",
@@ -345,6 +417,7 @@ stairsplus.defs = {
 			},
 		},
 		["_inner"] = {
+			_circular_saw_cost = 7,
 			node_box = {
 				type = "fixed",
 				fixed = {
@@ -355,6 +428,7 @@ stairsplus.defs = {
 			},
 		},
 		["_outer"] = {
+			_circular_saw_cost = 5,
 			node_box = {
 				type = "fixed",
 				fixed = {
@@ -364,6 +438,7 @@ stairsplus.defs = {
 			},
 		},
 		["_alt"] = {
+			_circular_saw_cost = 4,
 			node_box = {
 				type = "fixed",
 				fixed = {
@@ -373,6 +448,7 @@ stairsplus.defs = {
 			},
 		},
 		["_alt_1"] = {
+			_circular_saw_cost = 1,
 			node_box = {
 				type = "fixed",
 				fixed = {
@@ -382,6 +458,7 @@ stairsplus.defs = {
 			},
 		},
 		["_alt_2"] = {
+			_circular_saw_cost = 1,
 			node_box = {
 				type = "fixed",
 				fixed = {
@@ -391,6 +468,7 @@ stairsplus.defs = {
 			},
 		},
 		["_alt_4"] = {
+			_circular_saw_cost = 2,
 			node_box = {
 				type = "fixed",
 				fixed = {