diff --git a/modeling-cmds/openapi/api.json b/modeling-cmds/openapi/api.json
index 07ccc2cc..c6ac1074 100644
--- a/modeling-cmds/openapi/api.json
+++ b/modeling-cmds/openapi/api.json
@@ -7376,13 +7376,17 @@
           "translate": {
             "description": "Translate the replica this far along each dimension. Defaults to zero vector (i.e. same position as the original).",
             "default": {
-              "x": 0.0,
-              "y": 0.0,
-              "z": 0.0
+              "point3d": {
+                "point": {
+                  "x": 0.0,
+                  "y": 0.0,
+                  "z": 0.0
+                }
+              }
             },
             "allOf": [
               {
-                "$ref": "#/components/schemas/Point3d"
+                "$ref": "#/components/schemas/TranslateBy"
               }
             ]
           }
@@ -7464,6 +7468,83 @@
           "set"
         ]
       },
+      "TranslateBy": {
+        "description": "How to translate in space.",
+        "oneOf": [
+          {
+            "description": "Translate this much in each dimension.",
+            "type": "object",
+            "properties": {
+              "point3d": {
+                "type": "object",
+                "properties": {
+                  "point": {
+                    "description": "Which vector to translate along.",
+                    "allOf": [
+                      {
+                        "$ref": "#/components/schemas/Point3d"
+                      }
+                    ]
+                  }
+                },
+                "required": [
+                  "point"
+                ]
+              }
+            },
+            "required": [
+              "point3d"
+            ],
+            "additionalProperties": false
+          },
+          {
+            "description": "Translate along this edge or path segment.\n\nIf the edge is a circle, translates along the normal vector of this circle, going through the circle's center.\n\nIf the edge is linear, translates along that line's vector.",
+            "type": "object",
+            "properties": {
+              "edge": {
+                "type": "object",
+                "properties": {
+                  "id": {
+                    "description": "Which edge to translate along.",
+                    "type": "string",
+                    "format": "uuid"
+                  }
+                },
+                "required": [
+                  "id"
+                ]
+              }
+            },
+            "required": [
+              "edge"
+            ],
+            "additionalProperties": false
+          },
+          {
+            "description": "Translate along this face or sketch.\n\nIf the sketch is circular, translate along the normal vector of the face/sketch, through its center.\n\nIf the face is circular (i.e. the end of a cone or cylinder), this works the same as translating along a circular sketch.",
+            "type": "object",
+            "properties": {
+              "face": {
+                "type": "object",
+                "properties": {
+                  "id": {
+                    "description": "Which face to translate along.",
+                    "type": "string",
+                    "format": "uuid"
+                  }
+                },
+                "required": [
+                  "id"
+                ]
+              }
+            },
+            "required": [
+              "face"
+            ],
+            "additionalProperties": false
+          }
+        ]
+      },
       "UnitAngle": {
         "description": "The valid types of angle formats.",
         "oneOf": [
diff --git a/modeling-cmds/src/shared.rs b/modeling-cmds/src/shared.rs
index f8fec200..2fa2d6c4 100644
--- a/modeling-cmds/src/shared.rs
+++ b/modeling-cmds/src/shared.rs
@@ -83,6 +83,52 @@ impl Default for Rotation {
     }
 }
 
+/// How to translate in space.
+#[derive(Debug, Clone, PartialEq, Serialize, Deserialize, JsonSchema)]
+#[serde(rename_all = "snake_case")]
+#[cfg_attr(feature = "ts-rs", derive(ts_rs::TS))]
+#[cfg_attr(feature = "ts-rs", ts(export_to = "ModelingCmd.ts"))]
+pub enum TranslateBy {
+    /// Translate this much in each dimension.
+    Point3d {
+        /// Which vector to translate along.
+        point: Point3d<LengthUnit>,
+    },
+    /// Translate along this edge or path segment.
+    ///
+    /// If the edge is a circle, translates along the
+    /// normal vector of this circle, going through the circle's center.
+    ///
+    /// If the edge is linear, translates along that line's vector.
+    ///
+    /// If the edge is neither circular nor linear, the API will respond with an error.
+    Edge {
+        /// Which edge to translate along.
+        id: Uuid,
+    },
+    /// Translate along this face or sketch.
+    ///
+    /// If the sketch is circular, translate along
+    /// the normal vector of the face/sketch, through its center.
+    ///
+    /// If the face is circular (i.e. the end of a cone or cylinder),
+    /// this works the same as translating along a circular sketch.
+    ///
+    /// If the face is not circular, the API will respond with an error.
+    Face {
+        /// Which face to translate along.
+        id: Uuid,
+    },
+}
+
+impl Default for TranslateBy {
+    fn default() -> Self {
+        Self::Point3d {
+            point: Default::default(),
+        }
+    }
+}
+
 /// Ways to transform each solid being replicated in a repeating pattern.
 #[derive(Debug, Clone, PartialEq, Serialize, Deserialize, JsonSchema)]
 #[serde(rename_all = "snake_case")]
@@ -92,7 +138,7 @@ pub struct Transform {
     /// Translate the replica this far along each dimension.
     /// Defaults to zero vector (i.e. same position as the original).
     #[serde(default)]
-    pub translate: Point3d<LengthUnit>,
+    pub translate: TranslateBy,
     /// Scale the replica's size along each axis.
     /// Defaults to (1, 1, 1) (i.e. the same size as the original).
     #[serde(default = "same_scale")]