diff --git a/src/part.js b/src/part.js
index b4bd2cf4eee..7322e1354d5 100644
--- a/src/part.js
+++ b/src/part.js
@@ -4,6 +4,7 @@ import path from "./path";
 import snippet from "./snippet";
 import attributes from "./attributes";
 import * as hooklib from "hooks";
+import { round, units } from "./utils";
 
 function part(id) {
   this.attributes = new attributes();
@@ -11,6 +12,7 @@ function part(id) {
   this.paths = {};
   this.snippets = {};
   this.id = id;
+  this.freeId = 0;
   this.render = id.substr(0, 1) === "_" ? false : true;
   this.points.origin = new point(0, 0);
   for (let k in hooklib) this[k] = hooklib[k];
@@ -20,6 +22,9 @@ function part(id) {
   this.path = path;
   this.snippet = snippet;
 
+  // Expose round method to plugins
+  this.round = round;
+
   return this;
 }
 
@@ -38,4 +43,15 @@ part.prototype.macroRunner = function(args) {
   return method;
 };
 
+/** Returns an unused ID */
+part.prototype.getUid = function() {
+  this.freeId += 1;
+
+  return "" + this.freeId;
+};
+
+part.prototype.units = function(value) {
+  return units(value, this.context.settings.units);
+};
+
 export default part;
diff --git a/src/path.js b/src/path.js
index d502c5d32f1..d11b4c05d61 100644
--- a/src/path.js
+++ b/src/path.js
@@ -1,5 +1,6 @@
 import attributes from "./attributes";
-import { pathOffset } from "./utils";
+import Bezier from "bezier-js";
+import { pathOffset, pathLength } from "./utils";
 
 function path() {
   this.render = true;
@@ -70,12 +71,47 @@ path.prototype.asPathstring = function() {
   return d;
 };
 
-/** Returns this path as a Bezier object */
-path.prototype.asBezier = function() {};
-
 /** Returns offset of this path as a new path */
 path.prototype.offset = function(distance) {
   return pathOffset(this, distance);
 };
 
+/** Returns the length of this path */
+path.prototype.length = function() {
+  let current, start;
+  let length = 0;
+  for (let i in this.ops) {
+    let op = this.ops[i];
+    if (op.type === "move") {
+      start = op.to;
+    } else if (op.type === "line") {
+      length += op.from.dist(op.to);
+    } else if (op.type === "curve") {
+      length += new Bezier(
+        { x: current.x, y: current.y },
+        { x: op.cp1.x, y: op.cp1.y },
+        { x: op.cp2.x, y: op.cp2.y },
+        { x: op.to.x, y: op.to.y }
+      ).length();
+    } else if (op.type === "close") {
+      length += current.dist(start);
+    }
+    if (op.to) current = op.to;
+  }
+
+  return length;
+};
+
+/** Returns the startpoint of the path */
+path.prototype.start = function() {
+  return this.ops[0].to;
+};
+
+/** Returns the endpoint of the path */
+path.prototype.end = function() {
+  let op = this.ops[this.ops.length - 1];
+
+  if (op.type === "close") return this.start();
+  else return op.to;
+};
 export default path;
diff --git a/src/pattern.js b/src/pattern.js
index 6df91bcb27a..bcdcb3ab947 100644
--- a/src/pattern.js
+++ b/src/pattern.js
@@ -12,7 +12,8 @@ export default function pattern(config = false) {
     this.config = {
       parts: ["part"],
       measurements: {},
-      options: {}
+      options: {},
+      units: "metric"
     };
   } else {
     this.config = config;
@@ -49,7 +50,7 @@ export default function pattern(config = false) {
   this.options = {};
   if (typeof config.options !== "undefined" && config.options.length > 0) {
     for (let conf of config.options) {
-      if (conf.type === "percentage") this.options[conf.id] = conf.val / 100;
+      if (conf.type === "%") this.options[conf.id] = conf.val / 100;
       else this.options[conf.id] = conf.val;
     }
   }
diff --git a/src/point.js b/src/point.js
index a6a6e7d5826..395b0fe3a63 100644
--- a/src/point.js
+++ b/src/point.js
@@ -1,16 +1,12 @@
 import attributes from "./attributes";
+import { round } from "./utils";
 
 function point(x, y) {
-  this.x = this.round(x);
-  this.y = this.round(y);
+  this.x = round(x);
+  this.y = round(y);
   this.attributes = new attributes();
 }
 
-/** Rounds a value to PRECISION */
-point.prototype.round = function(value) {
-  return Math.round(value * 1e2) / 1e2;
-};
-
 /** Radians to degrees */
 point.prototype.rad2deg = function(radians) {
   return radians * 57.29577951308232;
@@ -33,7 +29,7 @@ point.prototype.dist = function(that) {
   let dx = this.x - that.x;
   let dy = this.y - that.y;
 
-  return this.round(Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2)));
+  return round(Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2)));
 };
 
 /** Returns slope of a line made by this point and that point */
diff --git a/src/utils.js b/src/utils.js
index bba097c1006..106af9462d7 100644
--- a/src/utils.js
+++ b/src/utils.js
@@ -70,6 +70,7 @@ export function shorthand(part) {
   let final = part.context.settings.mode === "draft" ? true : false;
   let paperless = part.context.settings.paperless === true ? true : false;
   return {
+    sa: part.context.settings.sa || 0,
     measurements: part.context.settings.measurements || {},
     options: part.context.options || {},
     values: part.context.values || {},
@@ -157,3 +158,14 @@ export function joinPaths(paths, closed = false) {
 
   return joint;
 }
+
+/** Convert value in mm to cm or imperial units */
+export function units(value, to = "metric") {
+  if (to === "imperial") return round(value / 25.4) + '"';
+  else return round(value / 10) + "cm";
+}
+
+/** Rounds a value to 2 decimals */
+export function round(value) {
+  return Math.round(value * 1e2) / 1e2;
+}