diff --git a/src/geo/polygons.js b/src/geo/polygons.js
index 9ad3c305..b8707453 100644
--- a/src/geo/polygons.js
+++ b/src/geo/polygons.js
@@ -898,7 +898,7 @@
             let ra = a[i];
             let rb = b[i];
             // test circularity
-            if (Math.abs(ra.c - rb.c) > 0.001) {
+            if (Math.abs(ra.c - rb.c) > 0.0005) {
                 return false;
             }
             // test perimeter
diff --git a/src/mode/fdm/slice.js b/src/mode/fdm/slice.js
index 6195bdd9..1eb3c8d3 100644
--- a/src/mode/fdm/slice.js
+++ b/src/mode/fdm/slice.js
@@ -1058,7 +1058,7 @@
         }
 
         POLY.subtract(topInner, downInner, bridges, flats, slice.z, minArea, {
-            wasm: options.wasm
+            // wasm: options.wasm
         });
     };