up

core/nodeslicer/nodes.py

@@ -74,8 +74,8 @@ class SLICENODE_InputObject(InputNode):
     bl_icon = "OBJECT_DATA"
 
 @register_class
-class SLICENODE_InputOverrides(InputNode):
-    input_type = "Overrides"
+class SLICENODE_InputSettings(InputNode):
+    input_type = "Settings"
     bl_icon = "OBJECT_DATA"
 
 @register_class
@@ -345,27 +345,26 @@ class SLICENODE_GetMesh(SliceNode):
 class SLICENODE_GetPaths(SliceNode):
     bl_label = "Get Paths"
 
-    attr_name: NfStringProperty(name="Extrusion Attr", default="e_mult") # pyright: ignore[reportInvalidTypeForm]
-    f_attr_name: NfStringProperty(name="Feedrate Attr", default="f_rate") # pyright: ignore[reportInvalidTypeForm]
-
     def init(self, context):
         self.add_input("SLICESOCK_Object")
+        self.add_input("SLICESOCK_String", "Extrusion Multiplier Attribute").value = 'e_mult'
+        self.add_input("SLICESOCK_String", "Feedrate Attribute").value = 'f_rate'
+        self.add_input("SLICESOCK_Settings", "Extra Attributes")
         self.add_output("SLICESOCK_Paths")
 
     def draw_buttons(self, context, layout):
-        assert layout
-        layout.prop(self, "attr_name")
-        layout.prop(self, "f_attr_name")
+        pass
 
     def evaluate_output(self, socket_name: str, **_kwargs) -> SlicePaths:
         obj: Any = self.resolve("Object")
-        attr_name: str = self.attr_name
-        f_attr_name: str = self.f_attr_name
+        attr_name: str = self.resolve("Extrusion Multiplier Attribute")
+        f_attr_name: str = self.resolve("Feedrate Attribute")
+        extra_attrs: dict[str, str] = self.resolve("Extra Attributes")
 
         from ...infra.blender.blender_mesh_capture import capture_mesh_edges
-        so, e_rates, f_rates = capture_mesh_edges(obj, attr_name=attr_name, f_attr_name=f_attr_name)
+        so, e_rates, f_rates, extra_attrs_data = capture_mesh_edges(obj, attr_name=attr_name, f_attr_name=f_attr_name, extra_attrs=extra_attrs)
 
-        return SlicePaths(so, extrusion_rate=e_rates, feedrate=f_rates)
+        return SlicePaths(so, extrusion_rate=e_rates, feedrate=f_rates, extra_attributes=extra_attrs_data)
 
 @register_class
 class SLICENODE_SliceShells(SliceNode):
@@ -643,6 +642,15 @@ class SLICENODE_GcodeRegexReplace(SliceNode):
             return gcode
 
         try:
+            # Convert $1, $2, ${name} etc to Python backreferences \g<1>, \g<2>, \g<name>
+            def subst(match):
+                if match.group(1): return '$'
+                elif match.group(2): return '\\g<' + match.group(2) + '>'
+                elif match.group(3): return '\\g<' + match.group(3) + '>'
+                return match.group(0)
+
+            replace = re.sub(r'(\$\$)|(?:\$\{([^}]+)\})|(?:\$([a-zA-Z0-9_]+))', subst, replace)
+
             return re.sub(find, replace, gcode)
         except Exception as e:
             print(f"Regex error in node {self.name}: {e}")
@@ -731,10 +739,10 @@ class SLICENODE_JoinGcode(SliceNodeJoiner):
 
 
 @register_class
-class SLICENODE_JoinOverrides(SliceNodeJoiner):
-    bl_label = "Join Overrides"
-    socket_type = "SLICESOCK_Overrides"
-    output_socket_type = "SLICESOCK_OverridesRo"
+class SLICENODE_JoinSettings(SliceNodeJoiner):
+    bl_label = "Join Settings"
+    socket_type = "SLICESOCK_Settings"
+    output_socket_type = "SLICESOCK_SettingsRo"
 
     def evaluate_output(self, socket_name: str, **_kwargs) -> dict[str, str]:
         merged: dict[str, str] = {}
@@ -1341,7 +1349,7 @@ class SLICENODE_PrusaslicerSlice(SliceNode):
     def init(self, context):
         self.add_input("SLICESOCK_Mesh", "Mesh")
         self.add_input("SLICESOCK_PrusaslicerConf", "Config")
-        self.add_input("SLICESOCK_Overrides", "Overrides")
+        self.add_input("SLICESOCK_Settings", "Settings")
         self.add_output("SLICESOCK_GcodeRo")
 
     def draw_buttons(self, context, layout):
@@ -1359,7 +1367,7 @@ class SLICENODE_PrusaslicerSlice(SliceNode):
         mesh_data: SlicingCollection | SlicingGroup = self.resolve("Mesh")
 
         conf_data = self.resolve("Config")
-        overrides = self.resolve("Overrides")
+        overrides = self.resolve("Settings")
 
         if not mesh_data: 
             if operator: operator.report({'ERROR'}, "No Mesh data connected")

core/nodeslicer/sockets.py

@@ -153,10 +153,8 @@ class SLICESOCK_PrusaslicerConf(LabelNodeSocket):
     default = None
     bl_color = (0.95, 0., 0., 1.0) # #F26C21
 
-
-
 @register_class
-class OverrideItem(bpy.types.PropertyGroup):
+class SettingItem(bpy.types.PropertyGroup):
     field: NfStringProperty(name="Field", default="") # pyright: ignore[reportInvalidTypeForm]
     value_str: NfStringProperty(name="Value", default="") # pyright: ignore[reportInvalidTypeForm]
 
@@ -170,10 +168,10 @@ class OverrideItem(bpy.types.PropertyGroup):
         row.prop(self, "value_str", text="")
         
 from ...infra.blender.mixins import CollectionMixin
-class SLICESOCK_Overrides_Common(CollectionMixin, InputNodeSocket):
-    bl_label = "Overrides"
+class SLICESOCK_Settings_Common(CollectionMixin, InputNodeSocket):
+    bl_label = "Settings"
     
-    items: CollectionProperty(type=OverrideItem) # pyright: ignore[reportInvalidTypeForm]
+    items: CollectionProperty(type=SettingItem) # pyright: ignore[reportInvalidTypeForm]
     
     bl_color = (1.0, 1.0, 0.0, 1.0) # Yellow
 
@@ -186,9 +184,9 @@ class SLICESOCK_Overrides_Common(CollectionMixin, InputNodeSocket):
         return overrides
 
 @register_class
-class SLICESOCK_Overrides(SLICESOCK_Overrides_Common): ...
+class SLICESOCK_Settings(SLICESOCK_Settings_Common): ...
 @register_class
-class SLICESOCK_OverridesRo(ReadonlySocket, SLICESOCK_Overrides_Common): ...
+class SLICESOCK_SettingsRo(ReadonlySocket, SLICESOCK_Settings_Common): ...
 
 @register_class
 class SLICESOCK_ExecutionLink(LabelNodeSocket):

core/nodeslicer/tree.py

@@ -160,7 +160,7 @@ class SLICENODE_MT_DataInput(Menu):
         layout.operator("node.add_node", text="Vector").type = "SLICENODE_InputVector"
         layout.separator()
         layout.operator("node.add_node", text="Object").type = "SLICENODE_InputObject"
-        layout.operator("node.add_node", text="Overrides").type = "SLICENODE_InputOverrides"
+        layout.operator("node.add_node", text="Settings").type = "SLICENODE_InputSettings"
         layout.operator("node.add_node", text="PrusaSlicer Config").type = "SLICENODE_PrusaslicerConf"
         layout.separator()
         layout.operator("node.add_node", text="Printer").type = "SLICENODE_InputPrinter"
@@ -215,7 +215,7 @@ class SLICENODE_MT_Joiners(Menu):
         layout.operator("node.add_node", text="Join Mesh Groups").type = "SLICENODE_JoinMeshGroups"
         layout.operator("node.add_node", text="Join Paths").type = "SLICENODE_JoinPaths"
         layout.operator("node.add_node", text="Join Gcode").type = "SLICENODE_JoinGcode"
-        layout.operator("node.add_node", text="Join Overrides").type = "SLICENODE_JoinOverrides"
+        layout.operator("node.add_node", text="Join Settings").type = "SLICENODE_JoinSettings"
         layout.operator("node.add_node", text="Join Execution").type = "SLICENODE_JoinExecution"
 
 @register_class

core/slice.py

@@ -12,8 +12,9 @@ class SlicePaths(list[np.ndarray]):
     groups: list[int]
     extrusion_rate: list[np.ndarray]
     feedrate: list[np.ndarray]
+    extra_attributes: dict[str, list[np.ndarray]]
 
-    def __init__(self, paths: list[np.ndarray] = [], groups: list[int] = [], extrusion_rate: list[np.ndarray] | None = None, feedrate: list[np.ndarray] | None = None):
+    def __init__(self, paths: list[np.ndarray] = [], groups: list[int] = [], extrusion_rate: list[np.ndarray] | None = None, feedrate: list[np.ndarray] | None = None, extra_attributes: dict[str, list[np.ndarray]] | None = None):
         super().__init__(paths)
         
         self.groups = []
@@ -32,7 +33,9 @@ class SlicePaths(list[np.ndarray]):
         else:
             self.feedrate = [np.zeros(len(p)) for p in paths]
         
-    def copy_with(self, paths: list[np.ndarray], groups: list[int] | None = None, extrusion_rate: list[np.ndarray] | None = None, feedrate: list[np.ndarray] | None = None) -> SlicePaths:
+        self.extra_attributes = extra_attributes or {}
+    
+    def copy_with(self, paths: list[np.ndarray], groups: list[int] | None = None, extrusion_rate: list[np.ndarray] | None = None, feedrate: list[np.ndarray] | None = None, extra_attributes: dict[str, list[np.ndarray]] | None = None) -> SlicePaths:
         """Returns a new SlicePaths object with new paths/groups but preserving all other metadata."""
         if extrusion_rate is None:
             # Only reuse extrusion_rate if path lengths match exactly
@@ -43,10 +46,14 @@ class SlicePaths(list[np.ndarray]):
             if len(paths) == len(self) and all(len(p) == len(op) for p, op in zip(paths, self)):
                 feedrate = self.feedrate
         
-        new_obj = SlicePaths(paths, groups if groups is not None else self.groups, extrusion_rate, feedrate)
+        if extra_attributes is None:
+            if len(paths) == len(self) and all(len(p) == len(op) for p, op in zip(paths, self)):
+                extra_attributes = self.extra_attributes
+
+        new_obj = SlicePaths(paths, groups if groups is not None else self.groups, extrusion_rate, feedrate, extra_attributes)
         # Copy any other attributes that might have been added
         for k, v in self.__dict__.items():
-            if k not in ["groups", "extrusion_rate", "feedrate"]:
+            if k not in ["groups", "extrusion_rate", "feedrate", "extra_attributes"]:
                 setattr(new_obj, k, v)
         return new_obj
 
@@ -534,6 +541,7 @@ class Pather(object):
         self.paths = paths
         self.extrusion_rates = getattr(paths, "extrusion_rate", [np.ones(len(p)) for p in paths])
         self.feedrates = getattr(paths, "feedrate", [np.zeros(len(p)) for p in paths])
+        self.extra_attributes = getattr(paths, "extra_attributes", {})
         self.bed_center_x: float = 250.
         self.bed_center_y: float = 250.
         self.feedrate: float = 1200.
@@ -593,6 +601,7 @@ class Pather(object):
 
             e_rates = self.extrusion_rates[i]
             f_rates = self.feedrates[i]
+            extras = {prefix: vals[i] for prefix, vals in self.extra_attributes.items()}
 
             x0, y0, z0 = coords[0]
 
@@ -606,6 +615,7 @@ class Pather(object):
             old_x, old_y, old_z = x0, y0, z0
 
             old_fr = 0
+            old_extras = {prefix: None for prefix in extras}
             for j, (p1, p2) in enumerate(zip(coords, coords[1:])):
                 seg_len: float = segment_length_3d(p1, p2)
                 e_segment = seg_len * self.extrusion_rate * e_rates[j]
@@ -624,6 +634,12 @@ class Pather(object):
                 if e_segment: cur_gcode += f" E{e_segment:.5f}"
                 if not old_fr == fr: cur_gcode += f" F{fr:.3f}"
 
+                for prefix, evals in extras.items():
+                    val = evals[j]
+                    if not old_extras[prefix] == val:
+                        cur_gcode += f" {prefix}{val:.3f}"
+                    old_extras[prefix] = val
+
                 gcode += [cur_gcode]
 
                 max_z = max(max_z, z)

doc/MODULES.md

@@ -28,7 +28,7 @@ This file provides a mapping of modules to their primary responsibilities and ke
 - `slice.py`:
     - `slice_at_range()`: Top-level slicing function that iterates through Z-heights.
     - `slice_at_z()`: Vectorized plane-mesh intersection using NumPy.
-    - `Pather`: Class that converts toolpaths into G-code strings.
+    - `Pather`: Class that converts toolpaths into G-code strings. Supports per-segment extrusion rates, feedrates, and custom extra attributes.
     - `segments_to_slice()`: Utility to convert raw intersection segments into closed loops using Pyclipper.
     - `link_segments()`: Logic for joining loose segments into continuous paths.
     - `buffer_slice()`: Offset utility using PyclipperOffset. Supports rotated offsetting.
@@ -42,7 +42,7 @@ This file provides a mapping of modules to their primary responsibilities and ke
 
 - `blender_mesh_capture.py`:
     - `SlicingObject`: Represents a single mesh as a NumPy triangle array.
-    - `capture_mesh_edges()`: Extracts edges from a Blender mesh for path-based workflows.
+    - `capture_mesh_edges()`: Extracts edges from a Blender mesh for path-based workflows. Supports capturing extra per-vertex attributes.
 
 - `blender_slice_nodes_generic.py`:
     - Base classes for NodeSlicer nodes (`SliceNode`) and sockets (`SliceNodeSocket`).

doc/NODES.md

@@ -12,8 +12,8 @@
 | `SLICESOCK_Mesh` | `SlicingObject` | NumPy NDArray (Triangles) | Internal mesh data (Transformed/Scaled) |
 | `SLICESOCK_Paths` | `SlicePaths` (list) | List of paths (N, 3) + groups | Generic toolpaths or slice boundaries |
 | `SLICESOCK_Gcode` | `str` | Multi-line string | Generated G-code text |
-| `SLICESOCK_Overrides` | `dict[str, str]` | Python dictionary | Mapping of configuration fields to values |
-| `SLICESOCK_OverridesRo` | `dict[str, str]` | Python dictionary | Read-only merged configuration overrides |
+| `SLICESOCK_Settings` | `dict[str, str]` | Python dictionary | Mapping of configuration fields to values |
+| `SLICESOCK_SettingsRo` | `dict[str, str]` | Python dictionary | Read-only merged configuration overrides |
 
 ## Detailed Data Types
 
@@ -28,6 +28,7 @@ The `SlicingObject` class wraps a high-performance NumPy representation of a Ble
 A custom list subclass `SlicePaths(list[np.ndarray])` containing toolpaths.
 - **Content**: Each `np.ndarray` has shape `(N, 3)`.
 - **Groups**: Maintains a `.groups` list of integers mapping each path to a layer or logical group.
+- **Extra Attributes**: Maintains an `.extra_attributes` dictionary mapping G-code prefixes (e.g., `S`, `M`) to lists of NumPy arrays, enabling per-segment custom parameters.
 - **Z-Awareness**: Coordinates are stored as 3D `(X, Y, Z)` to maintain the correct layer height.
 - **Topology**: Generated and cleaned using `pyclipper`.
 
@@ -53,6 +54,9 @@ All nodes are found in the **Add (Shift+A)** menu under the **SliceNodes** categ
 ### Geometry Processing
 - **Get Mesh**: Converts a Blender Object into internal `SlicingObject` format.
 - **Get Paths**: Extracts existing edges from a mesh as paths.
+    - **Extrusion Multiplier Attribute**: Mesh attribute to use for per-segment extrusion rates.
+    - **Feedrate Attribute**: Mesh attribute to use for per-segment feedrates.
+    - **Extra Attributes**: Dictionary mapping mesh attribute names to custom G-code prefixes (e.g., `opening_size` -> `S`).
 - **Slice Shells**: Slices a `SlicingObject` into 2D `SlicePaths` at a given layer height.
 - **Buffer Shells**: Offsets/buffers 2D `SlicePaths`. Supports rotated offsetting and multiple miter types.
 - **Infill**: Generates a cross-hatch grid or parallel lines clipped by boundary paths. 
@@ -66,7 +70,7 @@ All nodes are found in the **Add (Shift+A)** menu under the **SliceNodes** categ
 - **Join Mesh**: Merges multiple `SlicingObject` instances into one.
 - **Join Paths**: Combines multiple `SlicePaths`. Supports Sequential or Interleaved modes.
 - **Join Gcode**: Concatenates multiple G-code strings.
-- **Join Overrides**: Sequentially merges multiple override dictionaries. Later inputs overwrite earlier ones for matching keys.
+- **Join Settings**: Sequentially merges multiple override dictionaries. Later inputs overwrite earlier ones for matching keys.
 - **Integer Math**: Simple integer operations (Add, Multiply, etc.).
 
 ### Action & I/O

infra/blender/blender_mesh_capture.py

@@ -411,11 +411,12 @@ def _cached_capture_mesh_edges(
     matrix_tuple: tuple[float, ...], 
     scene_scale: float,
     attr_name: str = "e_mult",
-    f_attr_name: str = "f_rate"
-) -> tuple[list[NDArray[float64]], list[NDArray[float64]], list[NDArray[float64]]]:
+    f_attr_name: str = "f_rate",
+    extra_attrs: dict[str, str] | None = None
+) -> tuple[list[NDArray[float64]], list[NDArray[float64]], list[NDArray[float64]], dict[str, list[NDArray[float64]]]]:
     # This helper expects that the object and mesh exist and are accessible via bpy.data
     obj = bpy.data.objects.get(obj_name)
-    if not obj: return [], [], []
+    if not obj: return [], [], [], {}
 
     # We don't use obj_eval here directly as it's not hashable, 
     # but we assume this is called when we know we need to re-capture.
@@ -425,10 +426,10 @@ def _cached_capture_mesh_edges(
         obj_eval = obj.evaluated_get(depsgraph)
         mesh = obj_eval.to_mesh(preserve_all_data_layers=True, depsgraph=depsgraph)
     except Exception:
-        return [], [], []
+        return [], [], [], {}
 
     if not mesh or not mesh.vertices: 
-        return [], [], []
+        return [], [], [], {}
 
     try:
         world_mat = np.array(matrix_tuple).reshape(4, 4)
@@ -444,6 +445,14 @@ def _cached_capture_mesh_edges(
         if f_attr_name in mesh.attributes:
             mesh.attributes[f_attr_name].data.foreach_get("value", f_rates)
         
+        captured_extras = {}
+        if extra_attrs:
+            for attr_key, prefix in extra_attrs.items():
+                vals = np.zeros(num_verts, dtype=np.float64)
+                if attr_key in mesh.attributes:
+                    mesh.attributes[attr_key].data.foreach_get("value", vals)
+                captured_extras[prefix] = vals
+
         tx_verts = (verts @ world_mat[:3, :3].T + world_mat[:3, 3]) * scene_scale
 
         edges_set = {tuple(sorted(e.vertices)) for e in mesh.edges}
@@ -453,33 +462,42 @@ def _cached_capture_mesh_edges(
         raw_paths = np.split(tx_verts, split_at)
         raw_e_mults = np.split(e_mults, split_at)
         raw_f_rates = np.split(f_rates, split_at)
+        raw_extras = {prefix: np.split(vals, split_at) for prefix, vals in captured_extras.items()}
         indices_split = np.split(np.arange(num_verts), split_at)
 
         final_paths = []
         final_e_mults = []
         final_f_rates = []
+        final_extras = {prefix: [] for prefix in captured_extras}
         for i, path_coords in enumerate(raw_paths):
             if path_coords.shape[0] == 0:
                 continue
             idx = indices_split[i]
             e_vals = raw_e_mults[i]
             f_vals = raw_f_rates[i]
+            p_extras = {prefix: raw_extras[prefix][i] for prefix in captured_extras}
+
             if len(idx) > 2 and tuple(sorted((idx[0], idx[-1]))) in edges_set:
                 path_coords = np.vstack((path_coords, path_coords[0]))
                 e_vals = np.concatenate((e_vals, [e_vals[0]]))
                 f_vals = np.concatenate((f_vals, [f_vals[0]]))
+                for prefix in captured_extras:
+                    p_extras[prefix] = np.concatenate((p_extras[prefix], [p_extras[prefix][0]]))
+
             final_paths.append(path_coords)
             final_e_mults.append(e_vals)
             final_f_rates.append(f_vals)
+            for prefix in captured_extras:
+                final_extras[prefix].append(p_extras[prefix])
 
-        return final_paths, final_e_mults, final_f_rates
+        return final_paths, final_e_mults, final_f_rates, final_extras
 
     finally:
         if hasattr(obj_eval, "to_mesh_clear"):
             obj_eval.to_mesh_clear()
 
-def capture_mesh_edges(obj: Object, attr_name: str = "e_mult", f_attr_name: str = "f_rate") -> tuple[list[NDArray[float64]], list[NDArray[float64]], list[NDArray[float64]]]:
-    if not obj or not obj.data: return [], [], []
+def capture_mesh_edges(obj: Object, attr_name: str = "e_mult", f_attr_name: str = "f_rate", extra_attrs: dict[str, str] | None = None) -> tuple[list[NDArray[float64]], list[NDArray[float64]], list[NDArray[float64]], dict[str, list[NDArray[float64]]]]:
+    if not obj or not obj.data: return [], [], [], {}
 
     if obj.mode == 'EDIT':
         obj.update_from_editmode()
@@ -496,5 +514,6 @@ def capture_mesh_edges(obj: Object, attr_name: str = "e_mult", f_attr_name: str
         matrix_tuple, 
         scene_scale,
         attr_name,
-        f_attr_name
+        f_attr_name,
+        extra_attrs
     )

property_groups/bpy_property_groups.py

@@ -1,6 +1,6 @@
 import bpy
 
-from ..core.nodeslicer.sockets import OverrideItem
+from ..core.nodeslicer.sockets import SettingItem
 from ..registry import register_class
 
 extruder_options: list[tuple[str, str, str]] = [
@@ -29,4 +29,4 @@ class SlicerObjectPropertyGroup(bpy.types.PropertyGroup):
     object_type: NfEnumProperty(name="Part type", default="ModelPart", items=object_type_options)  # pyright: ignore[reportInvalidTypeForm]
     extruder: NfEnumProperty(name="Extruder", default="0", items=extruder_options)  # pyright: ignore[reportInvalidTypeForm]
     search_term: NfStringProperty(name="Search")  # pyright: ignore[reportInvalidTypeForm]
-    modifiers: bpy.props.CollectionProperty(type=OverrideItem)  # pyright: ignore[reportInvalidTypeForm]
+    modifiers: bpy.props.CollectionProperty(type=SettingItem)  # pyright: ignore[reportInvalidTypeForm]