Refactor multi-socket group system and fix G-code generation metadata synchronization

core/nodeslicer/nodes.py

@@ -357,12 +357,12 @@ class SLICENODE_GetPaths(SliceNode):
 
     def evaluate_output(self, socket_name: str, **_kwargs) -> SlicePaths:
         obj: Any = self.resolve("Object")
-        attr_name: str = self.resolve("Extrusion Multiplier Attribute")
+        e_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, extra_attrs_data = capture_mesh_edges(obj, attr_name=attr_name, f_attr_name=f_attr_name, extra_attrs=extra_attrs)
+        so, e_rates, f_rates, extra_attrs_data = capture_mesh_edges(obj, e_attr_name, f_attr_name, extra_attrs)
 
         return SlicePaths(so, extrusion_rate=e_rates, feedrate=f_rates, extra_attributes=extra_attrs_data)
 
@@ -723,7 +723,7 @@ class SliceNodeJoiner(SliceNode):
 
     def init(self, context):
         self.add_output(self.output_socket_type or self.socket_type)
-        self.add_multi_input(self.socket_type)
+        self.add_multi_socket_group(self.socket_type)
 
 @register_class
 class SLICENODE_JoinGcode(SliceNodeJoiner):
@@ -997,7 +997,7 @@ class SLICENODE_GcodeToFile(ExecSliceNode):
     def init(self, context):
         self._init_exec()
         self.add_input("SLICESOCK_DirPath", "Folder")
-        self.add_multi_input("SLICESOCK_Gcode", "Gcode")
+        self.add_multi_socket_group("SLICESOCK_Gcode", name="Gcode")
 
     def draw_buttons(self, context, layout):
         super().draw_buttons(context, layout)
@@ -1156,7 +1156,7 @@ class ExecSliceNode_DatabaseSubmit(ExecSliceNode):
 
     def init(self, context):
         self._init_exec()
-        self.add_multi_input("SLICESOCK_Gcode", "Gcode")
+        self.add_multi_socket_group("SLICESOCK_Gcode", name="Gcode")
 
     def draw_buttons(self, context, layout):
         super().draw_buttons(context, layout)
@@ -1176,7 +1176,6 @@ class ExecSliceNode_DatabaseSubmit(ExecSliceNode):
             import json
 
             if not gc:
-                if operator: operator.report({'ERROR'}, "No Gcode to send")
                 continue
             
             # Parse Metadata from Gcode
@@ -1250,10 +1249,8 @@ class ExecSliceNode_DatabaseSubmit(ExecSliceNode):
 
                 record_id = self._submit_to_db(token, fields, temp_path)
                 if operator: operator.report({'INFO'}, f"Submitted to {self._db_name} (Record: {record_id})")
-                return 'ok'
             except Exception as e:
                 if operator: operator.report({'ERROR'}, f"{self._db_name} Error: {str(e)}")
-                return 'error'
             finally:
                 if temp_path.exists():
                     temp_path.unlink()
@@ -1344,37 +1341,39 @@ class SLICENODE_PrusaslicerSlice(SliceNode):
     bl_label = "PrusaSlicer Slice"
 
     prusaslicer_executable: NfStringProperty(name="PrusaSlicer Path", subtype='FILE_PATH', default='flatpak run com.prusa3d.PrusaSlicer') # pyright: ignore[reportInvalidTypeForm]
-    gcode_result: NfStringProperty(name="Gcode Result", default="") # pyright: ignore[reportInvalidTypeForm]
 
     def init(self, context):
-        self.add_input("SLICESOCK_Mesh", "Mesh")
         self.add_input("SLICESOCK_PrusaslicerConf", "Config")
         self.add_input("SLICESOCK_Settings", "Settings")
-        self.add_output("SLICESOCK_GcodeRo")
+        self.add_multi_socket_group("SLICESOCK_Mesh", "SLICESOCK_GcodeRo", name="Slicing Group")
 
     def draw_buttons(self, context, layout):
         assert layout
         layout.prop(self, "prusaslicer_executable")
 
-    def evaluate_output(self, socket_name: str, **kwargs) -> Any:
+    def evaluate_output(self, socket_name: str, identifier: str = "", **kwargs) -> Any:
-        if socket_name == "Gcode":
+        if identifier.startswith("Slicing Group_ms_out_"):
-            self.evaluate()
+            try:
-            return self.gcode_result
+                idx = int(identifier.split("_")[-1])
+                return self.evaluate_for_index(idx)
+            except (ValueError, IndexError):
+                return ""
         return super().evaluate_output(socket_name, **kwargs)
 
-    def evaluate(self, operator=None):
+    def evaluate_for_index(self, index: int, operator=None) -> str:
-        self.gcode_result = ""
+        mesh_groups: list[SlicingCollection | SlicingGroup] = self.resolve_multi_input("Slicing Group")
-        mesh_data: SlicingCollection | SlicingGroup = self.resolve("Mesh")
+        if index >= len(mesh_groups):
+            return ""
+
+        mesh_data = mesh_groups[index]
+        if not mesh_data:
+            return ""
 
         conf_data = self.resolve("Config")
         overrides = self.resolve("Settings")
 
-        if not mesh_data: 
-            if operator: operator.report({'ERROR'}, "No Mesh data connected")
-            return 'no object'
         if not conf_data:
-            if operator: operator.report({'ERROR'}, "No Config connected")
+            return ""
-            return 'no config'
 
         # Extract data from config dict
         printer_id = conf_data['printer']
@@ -1388,7 +1387,7 @@ class SLICENODE_PrusaslicerSlice(SliceNode):
         else:
             slicing_group = SlicingGroup([])
             slicing_group.collections = {mesh_data.objects[0].name: mesh_data}
-        
+
         # Offset by the bed center
         def parse_bed_center(bed_shape_str: str) -> np.ndarray:
             try:
@@ -1403,13 +1402,12 @@ class SLICENODE_PrusaslicerSlice(SliceNode):
 
         bed_shape = cache.profiles[printer_id].all_conf_dict.get('bed_shape', '0x0,250x0,250x210,0x210')
         bed_center = parse_bed_center(bed_shape)
-        
+
         a_z = -slicing_group.min_z
         offset = np.array([bed_center[0], bed_center[1], a_z]) - np.array([slicing_group.center_xy[0], slicing_group.center_xy[1], 0])
         slicing_group.offset(offset)
 
         # Prepare overrides for generate_conf_writer
-        # The format expected by generate_conf_writer is overrides={'key': {'value': 'val'}}
         writer_overrides = {k: {'value': v} for k, v in overrides.items()}
 
         # Generate the ConfigWriter
@@ -1426,72 +1424,49 @@ class SLICENODE_PrusaslicerSlice(SliceNode):
 
         # Prepare 3mf path
         temp_dir = Path(tempfile.gettempdir())
-        output_path = temp_dir / f"tmp.3mf"
+        output_path = temp_dir / f"tmp_{index}.3mf"
 
         try:
             from ...infra._3mf_writer._3mf import prepare_3mf
             prepare_3mf(output_path, slicing_group, conf_writer, z_gcodes=[])
-            
+
-            # Actual slicing
             exe_str = self.prusaslicer_executable
-            if not exe_str:
+            if not exe_str: return ""
-                if operator: operator.report({'ERROR'}, "PrusaSlicer executable path is empty")
-                return 'error'
 
-            # Parse command (handles multi-word commands like flatpak)
             cmd_parts = shlex.split(exe_str)
-            if not cmd_parts:
+            if not cmd_parts: return ""
-                if operator: operator.report({'ERROR'}, "Invalid PrusaSlicer command")
-                return 'error'
 
-            # Try to resolve the first part as a path if it's not a command in PATH
             if not shutil.which(cmd_parts[0]):
                 abs_path = bpy.path.abspath(cmd_parts[0])
                 if os.path.exists(abs_path):
                     cmd_parts[0] = abs_path
-            
+
-            # Final check if command exists
             if not shutil.which(cmd_parts[0]):
-                if operator: operator.report({'ERROR'}, f"Command or executable not found: {cmd_parts[0]}")
+                return ""
-                self.gcode_result = ""
-                return 'error'
 
             gcode_path = output_path.with_suffix(".gcode")
-            
-            # Command: <exe> --export-gcode <3mf_path> --output <gcode_path>
             cmd = cmd_parts + ["--export-gcode", str(output_path), "--output", str(gcode_path)]
-            
+
-            # Run PrusaSlicer
             process = subprocess.run(cmd, capture_output=True, text=True)
             if process.returncode != 0:
-                if operator: operator.report({'ERROR'}, f"PrusaSlicer failed: {process.stderr}")
+                return ""
-                self.gcode_result = ""
-                return 'error'
 
-            # Read G-code
             if gcode_path.exists():
                 with open(gcode_path, 'r', encoding='utf-8') as f:
-                    self.gcode_result = f.read()
+                    gcode_result = f.read()
-                self.gcode_result += f"\n; binary_gcode = {binary_gcode_value}\n"
+                gcode_result += f"\n; binary_gcode = {binary_gcode_value}\n"
 
                 output_path.unlink()
-                
+                if gcode_path.exists(): gcode_path.unlink()
-                if operator: 
+
-                    operator.report({'INFO'}, f"Slicing complete. G-code generated.")
+                return gcode_result
             else:
-                if operator: operator.report({'ERROR'}, "G-code file was not generated by PrusaSlicer")
+                return ""
-                self.gcode_result = ""
-                return 'error'
 
         except Exception as e:
-            self.gcode_result = ""
-            if operator: operator.report({'ERROR'}, f"Failed to slice: {str(e)}")
             import traceback
             traceback.print_exc()
-            return 'error'
+            return ""
-
-        return 'ok'
-
 @register_class
 class SLICENODE_PrusaslicerPreview(ExecSliceNode):
     bl_label = "PrusaSlicer Preview"
@@ -1595,7 +1570,7 @@ class SLICENODE_GcodeToMesh(ExecSliceNode):
         last_e = 0.0
         
         offset_x, offset_y = 0.0, 0.0
-        default_extrusion_rate = 0.017 # Default fallback
+        custom_default_extrusion_rate = 0.0
 
         last_v_idx = -1
         last_p2 = None
@@ -1614,7 +1589,7 @@ class SLICENODE_GcodeToMesh(ExecSliceNode):
                     try: offset_y = float(comment.split('=')[1])
                     except ValueError: pass
                 elif comment.startswith("DEFAULT_EXTRUSION_RATE="):
-                    try: default_extrusion_rate = float(comment.split('=')[1])
+                    try: custom_default_extrusion_rate = float(comment.split('=')[1])
                     except ValueError: pass
 
             line_no_comment = line.split(';')[0].strip()
@@ -1651,8 +1626,8 @@ class SLICENODE_GcodeToMesh(ExecSliceNode):
                 
                 # Calculate e_rate (proportion between E and default_extrusion_rate)
                 seg_len_mm = segment_length_3d(p1, p2) * 1000.0
-                if seg_len_mm > 0 and default_extrusion_rate > 0:
+                if seg_len_mm > 0 and custom_default_extrusion_rate > 0:
-                    e_rate = (new_e / seg_len_mm) / default_extrusion_rate
+                    e_rate = (new_e / seg_len_mm) / custom_default_extrusion_rate
                 else:
                     e_rate = 1.0
 
@@ -1744,7 +1719,7 @@ class SLICENODE_Executor(ExecSliceNode, SliceNodeJoiner):
 
     def init(self, context):
         self._init_exec()
-        self.add_multi_input(self.socket_type, "Links")
+        self.add_multi_socket_group(self.socket_type, name="Links")
 
     def draw_buttons(self, context, layout):
         super().draw_buttons(context, layout)

core/nodeslicer/sockets.py

@@ -2,7 +2,6 @@ from __future__ import annotations
 from typing import Any
 import bpy
 from bpy.props import CollectionProperty
-from bpy.types import Property, PropertyGroup, bpy_struct
 from .bpy_ns_types import NfStringProperty, NfFloatProperty, NfIntProperty, NfEnumProperty, NfPointerProperty, NfFloatVectorProperty
 
 from ...registry import register_class

core/slice.py

@@ -1,7 +1,8 @@
 from __future__ import annotations
+from numpy import float64
 import numpy as np
 import pyclipper
-from typing import Any
+from typing import Any, Literal
 
 from .geometry import ndarray_lru_cache
 
@@ -111,13 +112,42 @@ class SlicePaths(list[np.ndarray]):
         if isinstance(other, SlicePaths):
             self.extend(other)
             self.groups.extend(other.groups)
+            self.extrusion_rate.extend(other.extrusion_rate)
+            self.feedrate.extend(other.feedrate)
+            for k, v in other.extra_attributes.items():
+                if k in self.extra_attributes:
+                    self.extra_attributes[k].extend(v)
+                else:
+                    # Pad with zeros for existing paths if we didn't have this attribute
+                    self.extra_attributes[k] = [np.zeros(len(p)) for p in self[:-len(other)]] + list(v)
+            # Pad existing attributes if 'other' didn't have them
+            for k in self.extra_attributes:
+                if k not in other.extra_attributes:
+                    self.extra_attributes[k].extend([np.zeros(len(p)) for p in other])
         else:
             self.extend(other)
             self.groups.extend(list(range(0,len(other))))
+            self.extrusion_rate.extend([np.ones(len(p)) for p in other])
+            self.feedrate.extend([np.zeros(len(p)) for p in other])
+            for k in self.extra_attributes:
+                self.extra_attributes[k].extend([np.zeros(len(p)) for p in other])
 
-    def append_with_group(self, path: np.ndarray, group: int = 0):
+    def append_with_group(self, path: np.ndarray, group: int = 0, extrusion_rate: np.ndarray | None = None, feedrate: np.ndarray | None = None, extra_attributes: dict[str, np.ndarray] | None = None):
         self.append(path)
         self.groups.append(group)
+        self.extrusion_rate.append(extrusion_rate if extrusion_rate is not None else np.ones(len(path)))
+        self.feedrate.append(feedrate if feedrate is not None else np.zeros(len(path)))
+        
+        extra_attributes = extra_attributes or {}
+        for k, v in extra_attributes.items():
+            if k in self.extra_attributes:
+                self.extra_attributes[k].append(v)
+            else:
+                self.extra_attributes[k] = [np.zeros(len(p)) for p in self[:-1]] + [v]
+        
+        for k in self.extra_attributes:
+            if k not in extra_attributes:
+                self.extra_attributes[k].append(np.zeros(len(path)))
 
 def slice_at_range(models, z_values) -> list[list[np.ndarray]]:
     if not models:
@@ -539,9 +569,26 @@ class Pather(object):
 
     def __init__(self, paths: list[np.ndarray], **kwargs) -> None:
         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])
+        # Robust initialization: ensure metadata lists match paths length
-        self.extra_attributes = getattr(paths, "extra_attributes", {})
+        e_rate = getattr(paths, "extrusion_rate", None)
+        if e_rate is not None and len(e_rate) == len(paths):
+            self.extrusion_rates = e_rate
+        else:
+            self.extrusion_rates = [np.ones(len(p)) for p in paths]
+            
+        f_rate = getattr(paths, "feedrate", None)
+        if f_rate is not None and len(f_rate) == len(paths):
+            self.feedrates = f_rate
+        else:
+            self.feedrates = [np.zeros(len(p)) for p in paths]
+            
+        extra = getattr(paths, "extra_attributes", None)
+        if extra is not None and all(len(v) == len(paths) for v in extra.values()):
+            self.extra_attributes = extra
+        else:
+            self.extra_attributes = {}
+            
         self.bed_center_x: float = 250.
         self.bed_center_y: float = 250.
         self.feedrate: float = 1200.
@@ -599,8 +646,8 @@ class Pather(object):
             if len(coords) < 2:
                 continue
 
-            e_rates = self.extrusion_rates[i]
+            e_rate = self.extrusion_rates[i]
-            f_rates = self.feedrates[i]
+            f_rate = self.feedrates[i]
             extras = {prefix: vals[i] for prefix, vals in self.extra_attributes.items()}
 
             x0, y0, z0 = coords[0]
@@ -618,10 +665,10 @@ class Pather(object):
             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]
+                e_segment = seg_len * self.extrusion_rate * e_rate[j]
                 
                 # Per-segment feedrate value (not multiplier)
-                fr = f_rates[j] if f_rates[j] > 0 else self.feedrate
+                fr = f_rate[j] if f_rate[j] > 0 else self.feedrate
 
                 old_x, old_y, old_z = p1
                 x, y, z = p2

infra/blender/blender_mesh_capture.py

@@ -410,7 +410,7 @@ def _cached_capture_mesh_edges(
     mesh_name: str, 
     matrix_tuple: tuple[float, ...], 
     scene_scale: float,
-    attr_name: str = "e_mult",
+    e_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]]]]:
@@ -438,8 +438,8 @@ def _cached_capture_mesh_edges(
         mesh.vertices.foreach_get("co", verts.ravel())
 
         e_mults = np.ones(num_verts, dtype=np.float64)
-        if attr_name in mesh.attributes:
+        if e_attr_name in mesh.attributes:
-            mesh.attributes[attr_name].data.foreach_get("value", e_mults)
+            mesh.attributes[e_attr_name].data.foreach_get("value", e_mults)
 
         f_rates = np.zeros(num_verts, dtype=np.float64)
         if f_attr_name in mesh.attributes:
@@ -496,7 +496,7 @@ def _cached_capture_mesh_edges(
         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", extra_attrs: dict[str, str] | None = None) -> tuple[list[NDArray[float64]], list[NDArray[float64]], list[NDArray[float64]], dict[str, list[NDArray[float64]]]]:
+def capture_mesh_edges(obj: Object, e_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':
@@ -513,7 +513,7 @@ def capture_mesh_edges(obj: Object, attr_name: str = "e_mult", f_attr_name: str
         obj.data.name, 
         matrix_tuple, 
         scene_scale,
-        attr_name,
+        e_attr_name,
         f_attr_name,
         extra_attrs
     )

infra/blender/blender_slice_nodes_generic.py

@@ -27,7 +27,7 @@ class SliceNodeSocket(NodeSocket, AutoBlIdName):
 from ...registry import get_label_by_name
 class SliceNode(Node, AutoBlIdName):
     def update(self) -> None: 
-        self._update_multi_inputs()
+        self._update_multi_groups()
 
     def evaluate_output(self, socket_name: str, **_kwargs) -> Any: ...
 
@@ -36,50 +36,71 @@ class SliceNode(Node, AutoBlIdName):
         visited = getattr(self, "_current_visited", None)
         return resolve_input(self.inputs.get(fieldname), cache=cache, visited=visited)
 
-    def add_output(self, bl_idname: str, name: str = "", identifier: str = ""):
+    def add_output(self, bl_idname: str, name: str = "", identifier: str = "", hide: bool = False):
         eval_name = name or get_label_by_name(bl_idname)
-        return self.outputs.new(bl_idname, eval_name, identifier=identifier or eval_name)
+        sock = self.outputs.new(bl_idname, eval_name, identifier=identifier or eval_name)
+        sock.hide = hide
+        return sock
 
-    def add_input(self, bl_idname: str, name: str = "", identifier: str = ""):
+    def add_input(self, bl_idname: str, name: str = "", identifier: str = "", hide: bool = False):
         eval_name = name or get_label_by_name(bl_idname)
-        return self.inputs.new(bl_idname, eval_name, identifier=identifier or eval_name)
+        sock = self.inputs.new(bl_idname, eval_name, identifier=identifier or eval_name)
+        sock.hide = hide
+        return sock
 
-    def add_multi_input(self, bl_idname: str, name: str = "") -> None:
+    def add_multi_socket_group(self, in_type: str, out_type: str = "", name: str = "", in_name: str = "", out_name: str = ""):
-        if not self.get('multi_sockets'): self['multi_sockets'] = {}
+        if not self.get('multi_groups'): self['multi_groups'] = {}
-        if not self['multi_sockets'].get(name): self['multi_sockets'][name] = {'bl_idname': bl_idname, 'name': name or get_label_by_name(bl_idname)}
+        group_id = name or in_name or out_name or in_type
-        self._update_multi_inputs()
+        self['multi_groups'][group_id] = {
+            'in_type': in_type,
+            'out_type': out_type,
+            'in_name': in_name or name or get_label_by_name(in_type),
+            'out_name': out_name or name or (get_label_by_name(out_type) if out_type else ""),
+        }
+        self._update_multi_groups()
     
     def resolve_multi_input(self, fieldname) -> Any:
         cache = getattr(self, "_current_cache", None)
         visited = getattr(self, "_current_visited", None)
-        inputs = [i for i in list(self.inputs) if i.name == fieldname]
+        # Search by name or identifier prefix for multi-groups
+        inputs = [i for i in list(self.inputs) if i.name == fieldname or i.identifier.startswith(f"{fieldname}_ms_in_")]
         return [resolve_input(r, cache=cache, visited=visited) for r in inputs]
 
-    def _update_multi_inputs(self):
+    def _update_multi_groups(self):
-        if not self.get('multi_sockets'): return
+        if not self.get('multi_groups'): return
-        for k, ms in self['multi_sockets'].items():
+        
-            def is_active(input) -> bool:
+        for group_id, cfg in self['multi_groups'].items():
-                a: bool = input.is_linked or getattr(input, 'value', False)
+            in_type = cfg['in_type']
-                b: bool = getattr(inputs()[-1], 'value', False)
+            out_type = cfg.get('out_type', '')
-                return a or b
+            in_name = cfg['in_name']
+            out_name = cfg['out_name']
+            
+            def get_ins(): return [i for i in self.inputs if i.identifier.startswith(f"{group_id}_ms_in_")]
+            def get_outs(): return [o for o in self.outputs if o.identifier.startswith(f"{group_id}_ms_out_")]
+            def is_active(s): return s.is_linked or bool(getattr(s, 'value', False))
 
-            def inputs():
+            ins = get_ins()
-                return [i for i in list(self.inputs) if i.name == ms['name']]
+            
+            if not ins:
+                self.add_input(in_type, in_name, identifier=f"{group_id}_ms_in_0")
+                if out_type:
+                    self.add_output(out_type, out_name, identifier=f"{group_id}_ms_out_0")
+                ins = get_ins()
 
-            socket_type = ms['bl_idname']
+            if is_active(ins[-1]):
-            name = ms['name']
+                idx = len(ins)
+                self.add_input(in_type, in_name, identifier=f"{group_id}_ms_in_{idx}")
+                if out_type:
+                    self.add_output(out_type, out_name, identifier=f"{group_id}_ms_out_{idx}")
+                ins = get_ins()
 
-            if len(inputs()) == 0:
+            while len(ins) > 1:
-                self.add_input(socket_type, name, name+str(len(inputs())))
+                if not is_active(ins[-1]) and not is_active(ins[-2]):
-                return
+                    self.inputs.remove(ins[-1])
-
+                    outs = get_outs()
-            if is_active(inputs()[-1]):
+                    if out_type and len(outs) >= len(ins):
-                self.add_input(socket_type, name, name+str(len(inputs())))
+                        self.outputs.remove(outs[-1])
-
+                    ins.pop()
-            while True:
-                if len(inputs()) < 2: break
-                if not is_active(inputs()[-1]) and not is_active(inputs()[-2]):
-                    self.inputs.remove(inputs()[-1])
                     continue
                 break
     
@@ -201,7 +222,9 @@ def _resolve_output(
     visited = set() if visited is None else visited
 
     assert socket.node
-    key = (socket.node.as_pointer(), socket.node.name, socket.name)
+    # Use identifier instead of name for the cache key, as multiple sockets 
+    # (especially in multi-groups) can share the same name but must have unique identifiers.
+    key = (socket.node.as_pointer(), socket.node.name, socket.identifier)
     if key in cache: return cache[key]
 
     node_key = (socket.node.as_pointer(), socket.node.name)
@@ -234,7 +257,13 @@ def _resolve_output(
                     return default
 
                 assert socket.node.evaluate_output
-                value = socket.node.evaluate_output(socket.name, cache=cache, visited=visited)
+                value = socket.node.evaluate_output(
+                    socket.name, 
+                    identifier=socket.identifier, 
+                    socket=socket, 
+                    cache=cache, 
+                    visited=visited
+                )
                 cache[key] = value
                 return value
             finally: