feat(core): add extended grip type

models/core/README.md

@@ -47,15 +47,15 @@ Open any file in `parts/` with OpenSCAD and use the **Customizer** panel to adju
 
 - **`connector.scad`**: Customize dimensions, directions, pull-through axes, feet, and orientation
 - **`support.scad`**: Customize length and hole configurations
-- **`lockpin.scad`**: Customize grip type (standard or no-grip)
+- **`lockpin.scad`**: Customize grip type (standard, extended or no-grip)
 
 ### Exporting Variants
 
 The `presets/` folder contains modules for batch-exporting all logical variants:
 
 - **`connectors.scad`**: Organized collections (standard, feet, pull-through, etc.)
 - **`supports.scad`**: Various support lengths with different hole configurations
-- **`lockpins.scad`**: Standard grip and no-grip variants
+- **`lockpins.scad`**: Standard grip, extended and no-grip variants
 
 ## 🔧 Core Components
 
@@ -75,6 +75,7 @@ Junction pieces that join supports in multiple directions.
 ### 3. **Lock Pins**
 4mm square pins that secure connectors to supports via tension fit.
 - Standard grip: Two grip arms for easy insertion/removal
+- Extended grip: Two asymmetric grip arms with a dominant outer arm.
 - No-grip variant: Smooth design for minimal profile
 - Bidirectional tension hole for secure fit
 

models/core/lib/lockpin.scad

@@ -48,6 +48,7 @@ grip_base_length = grip_thickness_inner + grip_thickness_outer + grip_distance +
  * Parameters:
  *   grip_type (string, default="standard"): Type of grip for the lock pin.
  *       - "standard": Two grip arms on both sides.
+ *       - "extended": Standard grip with an extended outer arm for improved stability.
  *       - "no_grip": No grip arms.
  *
  * Produces:
@@ -82,28 +83,29 @@ module lockpin(grip_type = "standard") {
  *
  * Creates the grip part of the lock pin.
  * If grip_type is "no_grip", no grip arms are created.
- * If grip_type is "standard", two grip arms are created on both sides.
+ * If grip_type is "standard", a symmetric two-stage grip is created.
+ * If grip_type is "extended", standard grip with an extended outer arm for improved stability.
  * If grip_type is "z_grip", a Z-shaped grip variant is created (not implemented yet).
  */
 module grip(grip_type = "standard") {
   if (grip_type != "no_grip") {
     grip_base_dimensions = [lockpin_width_outer, lockpin_height, grip_base_length];
-    grip_outer_dimensions = [grip_width, lockpin_height, grip_thickness_outer];
+    grip_outer_dimensions = [grip_type == "extended"?grip_width * 1.5:grip_width, lockpin_height, grip_thickness_outer];
     grip_inner_dimensions = [grip_width, lockpin_height, grip_thickness_inner];
 
     base_translation = lockpin_prismoid_length + lockpin_endpart_length - lockpin_chamfer - TOLERANCE/2;
 
     union() {
       // Base part of the grip
       translate([0, 0, -base_translation - grip_base_length / 2])
-      cuboid(grip_base_dimensions, chamfer=lockpin_chamfer, except=TOP);
+        cuboid(grip_base_dimensions, chamfer=lockpin_chamfer, except=TOP);
 
-      if(grip_type == "standard") {
+      if(grip_type == "standard" || grip_type == "extended") {
         translate([0, 0, -base_translation - grip_base_length + grip_thickness_outer / 2])
-        cuboid(grip_outer_dimensions, chamfer=lockpin_chamfer, except=TOP);
+          cuboid(grip_outer_dimensions, chamfer=lockpin_chamfer, except=TOP);
         // Inner part of the grip
         translate([0, 0, -base_translation - grip_base_length + grip_thickness_outer + grip_thickness_inner / 2 + grip_distance])
-        cuboid(grip_inner_dimensions, chamfer=lockpin_chamfer, except=TOP);
+          cuboid(grip_inner_dimensions, chamfer=lockpin_chamfer, except=TOP);
       } else if (grip_type == "z_grip") {
         // TODO: Z-Grip variant has only 1 arm on each side but each arm is thicker
         echo("Z-Grip variant not implemented yet.");

models/core/makerworld/connector.scad

@@ -308,22 +308,22 @@ module lockpin(grip_type = "standard") {
 module grip(grip_type = "standard") {
   if (grip_type != "no_grip") {
     grip_base_dimensions = [lockpin_width_outer, lockpin_height, grip_base_length];
-    grip_outer_dimensions = [grip_width, lockpin_height, grip_thickness_outer];
+    grip_outer_dimensions = [grip_type == "extended"?grip_width * 1.5:grip_width, lockpin_height, grip_thickness_outer];
     grip_inner_dimensions = [grip_width, lockpin_height, grip_thickness_inner];
 
     base_translation = lockpin_prismoid_length + lockpin_endpart_length - lockpin_chamfer - TOLERANCE/2;
 
     union() {
 
       translate([0, 0, -base_translation - grip_base_length / 2])
-      cuboid(grip_base_dimensions, chamfer=lockpin_chamfer, except=TOP);
+        cuboid(grip_base_dimensions, chamfer=lockpin_chamfer, except=TOP);
 
-      if(grip_type == "standard") {
+      if(grip_type == "standard" || grip_type == "extended") {
         translate([0, 0, -base_translation - grip_base_length + grip_thickness_outer / 2])
-        cuboid(grip_outer_dimensions, chamfer=lockpin_chamfer, except=TOP);
+          cuboid(grip_outer_dimensions, chamfer=lockpin_chamfer, except=TOP);
 
         translate([0, 0, -base_translation - grip_base_length + grip_thickness_outer + grip_thickness_inner / 2 + grip_distance])
-        cuboid(grip_inner_dimensions, chamfer=lockpin_chamfer, except=TOP);
+          cuboid(grip_inner_dimensions, chamfer=lockpin_chamfer, except=TOP);
       } else if (grip_type == "z_grip") {
 
         echo("Z-Grip variant not implemented yet.");

models/core/makerworld/lockpin.scad

@@ -308,22 +308,22 @@ module lockpin(grip_type = "standard") {
 module grip(grip_type = "standard") {
   if (grip_type != "no_grip") {
     grip_base_dimensions = [lockpin_width_outer, lockpin_height, grip_base_length];
-    grip_outer_dimensions = [grip_width, lockpin_height, grip_thickness_outer];
+    grip_outer_dimensions = [grip_type == "extended"?grip_width * 1.5:grip_width, lockpin_height, grip_thickness_outer];
     grip_inner_dimensions = [grip_width, lockpin_height, grip_thickness_inner];
 
     base_translation = lockpin_prismoid_length + lockpin_endpart_length - lockpin_chamfer - TOLERANCE/2;
 
     union() {
 
       translate([0, 0, -base_translation - grip_base_length / 2])
-      cuboid(grip_base_dimensions, chamfer=lockpin_chamfer, except=TOP);
+        cuboid(grip_base_dimensions, chamfer=lockpin_chamfer, except=TOP);
 
-      if(grip_type == "standard") {
+      if(grip_type == "standard" || grip_type == "extended") {
         translate([0, 0, -base_translation - grip_base_length + grip_thickness_outer / 2])
-        cuboid(grip_outer_dimensions, chamfer=lockpin_chamfer, except=TOP);
+          cuboid(grip_outer_dimensions, chamfer=lockpin_chamfer, except=TOP);
 
         translate([0, 0, -base_translation - grip_base_length + grip_thickness_outer + grip_thickness_inner / 2 + grip_distance])
-        cuboid(grip_inner_dimensions, chamfer=lockpin_chamfer, except=TOP);
+          cuboid(grip_inner_dimensions, chamfer=lockpin_chamfer, except=TOP);
       } else if (grip_type == "z_grip") {
 
         echo("Z-Grip variant not implemented yet.");

models/core/makerworld/support.scad

@@ -310,22 +310,22 @@ module lockpin(grip_type = "standard") {
 module grip(grip_type = "standard") {
   if (grip_type != "no_grip") {
     grip_base_dimensions = [lockpin_width_outer, lockpin_height, grip_base_length];
-    grip_outer_dimensions = [grip_width, lockpin_height, grip_thickness_outer];
+    grip_outer_dimensions = [grip_type == "extended"?grip_width * 1.5:grip_width, lockpin_height, grip_thickness_outer];
     grip_inner_dimensions = [grip_width, lockpin_height, grip_thickness_inner];
 
     base_translation = lockpin_prismoid_length + lockpin_endpart_length - lockpin_chamfer - TOLERANCE/2;
 
     union() {
 
       translate([0, 0, -base_translation - grip_base_length / 2])
-      cuboid(grip_base_dimensions, chamfer=lockpin_chamfer, except=TOP);
+        cuboid(grip_base_dimensions, chamfer=lockpin_chamfer, except=TOP);
 
-      if(grip_type == "standard") {
+      if(grip_type == "standard" || grip_type == "extended") {
         translate([0, 0, -base_translation - grip_base_length + grip_thickness_outer / 2])
-        cuboid(grip_outer_dimensions, chamfer=lockpin_chamfer, except=TOP);
+          cuboid(grip_outer_dimensions, chamfer=lockpin_chamfer, except=TOP);
 
         translate([0, 0, -base_translation - grip_base_length + grip_thickness_outer + grip_thickness_inner / 2 + grip_distance])
-        cuboid(grip_inner_dimensions, chamfer=lockpin_chamfer, except=TOP);
+          cuboid(grip_inner_dimensions, chamfer=lockpin_chamfer, except=TOP);
       } else if (grip_type == "z_grip") {
 
         echo("Z-Grip variant not implemented yet.");