diff --git a/src/services/geometryGenerator.ts b/src/services/geometryGenerator.ts
index 702cdcc..a0a29af 100644
--- a/src/services/geometryGenerator.ts
+++ b/src/services/geometryGenerator.ts
@@ -318,6 +318,9 @@ export const createBinGeometry = (
         const lengthRatio = pMax - pMin;
         const midRatio = pMin + (lengthRatio / 2);
 
+        // FIX: Subtract thickness because partitions sit ON TOP of the floor
+        const effectiveHeight = Math.max(0.1, p.height - thickness);
+
         // --- PERFORATED LOGIC FOR PARTITIONS ---
         // If enabled, use Plate. Else use Extrude Solid.
         const usePerf = perforation && perforation.enabled;
@@ -334,7 +337,7 @@ export const createBinGeometry = (
                 pY = (-innerDepth / 2) + (innerDepth * midRatio); // Center of partition
 
                 // Create Plate (Length, Height)
-                const plate = createPerforatedPlate(pLen, p.height, thickness, perforation!);
+                const plate = createPerforatedPlate(pLen, effectiveHeight, thickness, perforation!);
                 plate.translate(-pLen / 2, 0, 0); // Center X
 
                 // Rotate to align with Depth (along Z)
@@ -352,7 +355,7 @@ export const createBinGeometry = (
                 pX = (-innerWidth / 2) + (innerWidth * midRatio);
                 pY = (-innerDepth / 2) + (innerDepth * p.offset);
 
-                const plate = createPerforatedPlate(pLen, p.height, thickness, perforation!);
+                const plate = createPerforatedPlate(pLen, effectiveHeight, thickness, perforation!);
                 plate.translate(-pLen / 2, 0, 0); // Center X
 
                 // Already aligned with X. Thickness along Z.
@@ -381,7 +384,7 @@ export const createBinGeometry = (
             }
 
             const partShape = createRoundedRectShape(pWidth, pDepth, 0.1);
-            const partGeo = new THREE.ExtrudeGeometry(partShape, { depth: p.height, bevelEnabled: false });
+            const partGeo = new THREE.ExtrudeGeometry(partShape, { depth: effectiveHeight, bevelEnabled: false });
             partGeo.rotateX(-Math.PI / 2);
             partGeo.translate(pX, thickness, pY);
             geometries.push(partGeo);
@@ -409,8 +412,9 @@ export const createBinGeometry = (
             const hEnd = Math.min(p.height, getNeighborHeight(pMax));
 
             const addFillet = (x: number, y: number, rotY: number, h: number) => {
-                if (h <= 1) return;
-                const geo = new THREE.ExtrudeGeometry(filletShape, { depth: h, bevelEnabled: false });
+                const hEff = Math.max(0.1, h - thickness);
+                if (hEff <= 1) return;
+                const geo = new THREE.ExtrudeGeometry(filletShape, { depth: hEff, bevelEnabled: false });
                 geo.rotateX(-Math.PI / 2);
                 geo.rotateY(rotY);
                 geo.translate(x, thickness, y);