diff --git a/src/sliceActions/addBrim.js b/src/sliceActions/addBrim.js
index 6d3ffd5..f11cc66 100644
--- a/src/sliceActions/addBrim.js
+++ b/src/sliceActions/addBrim.js
@@ -1,9 +1,9 @@
+import Shape from 'Doodle3D/clipper-js';
 import * as THREE from 'three.js';
 import { PRECISION } from '../constants.js';
 
 const offsetOptions = {
-  jointType: 'jtSquare',
-  endType: 'etClosedPolygon',
+  jointType: 'jtRound',
   miterLimit: 2.0,
   roundPrecision: 0.25
 };
@@ -14,8 +14,13 @@ export default function addBrim(slices, settings) {
   let { brimOffset } = settings.config;
   brimOffset /= PRECISION;
 
-  const fistLayer = slices[0];
-  fistLayer.brim = fistLayer
-    .getOutline()
-    .offset(brimOffset, offsetOptions);
+  const [fistLayer] = slices;
+
+  fistLayer.brim = fistLayer.parts.reduce((brim, { shape }) => {
+    brim.join(shape.offset(brimOffset, {
+      ...offsetOptions,
+      endType: shape.closed ? 'etClosedPolygon' : 'etOpenRound'
+    }));
+    return brim;
+  }, new Shape([], true)).simplify('pftNonZero');
 }