diff --git a/src/kiri-mode/fdm/slice.js b/src/kiri-mode/fdm/slice.js
index 9df535c4..6c1ec009 100644
--- a/src/kiri-mode/fdm/slice.js
+++ b/src/kiri-mode/fdm/slice.js
@@ -1098,7 +1098,7 @@ function addSolidFills(slice, polys) {
  * project bottom flats down
  */
 function projectFlats(slice, count) {
-    if (slice.isSolidLayer || !slice.down || !slice.flats) return;
+    if (!slice.down || !slice.flats) return;
     projectSolid(slice, slice.flats, count, false, true);
 };
 
@@ -1106,7 +1106,7 @@ function projectFlats(slice, count) {
  * project top bridges up
  */
 function projectBridges(slice, count) {
-    if (slice.isSolidLayer || !slice.up || !slice.bridges) return;
+    if (!slice.up || !slice.bridges) return;
     projectSolid(slice, slice.bridges, count, true, true);
 };
 
@@ -1123,6 +1123,10 @@ function doSolidsFill(slice, spacing, angle, minArea, fillQ) {
         return;
     }
 
+    if (slice.isSolidLayer) {
+        return;
+    }
+
     let unioned = POLY.union(solids, undefined, true, { wasm: true }).flat(),
         isSLA = (spacing === undefined && angle === undefined);
 
@@ -1448,7 +1452,7 @@ function fillSupportPolys(promises, polys, linewidth, density, z, isBelt) {
  * @returns {*}
  */
 function projectSolid(slice, polys, count, up, first) {
-    if (!slice || slice.isSolidLayer || count <= 0) {
+    if (!slice || count <= 0) {
         return;
     }
     let clones = polys.clone(true);