diff --git a/src/interface/Settings.js b/src/interface/Settings.js
index e2303a8..e4c781f 100644
--- a/src/interface/Settings.js
+++ b/src/interface/Settings.js
@@ -144,7 +144,7 @@ class Settings extends React.Component {
       case 'settings.innerShell.flowRate':
       case 'settings.outerShell.speed':
       case 'settings.outerShell.flowRate':
-      case 'settings.innerInfill.gridSize':
+      case 'settings.innerInfill.precentage':
       case 'settings.innerInfill.speed':
       case 'settings.innerInfill.flowRate':
       case 'settings.outerInfill.speed':
@@ -306,7 +306,7 @@ class Settings extends React.Component {
               <TextField name="settings.outerShell.speed" fullWidth floatingLabelText="Speed" type="number" />
               <TextField name="settings.outerShell.flowRate" fullWidth floatingLabelText="Flow rate" type="number" />
               <p>Inner infill</p>
-              <TextField name="settings.innerInfill.gridSize" fullWidth floatingLabelText="Grid size" type="number" />
+              <TextField name="settings.innerInfill.precentage" fullWidth floatingLabelText="Percentage" type="number" />
               <TextField name="settings.innerInfill.speed" fullWidth floatingLabelText="Speed" type="number" />
               <TextField name="settings.innerInfill.flowRate" fullWidth floatingLabelText="Flow rate" type="number" />
               <p>Outer infill</p>
diff --git a/src/settings/default.yml b/src/settings/default.yml
index 58f1d73..f69d507 100644
--- a/src/settings/default.yml
+++ b/src/settings/default.yml
@@ -39,7 +39,7 @@ outerShell:
 innerInfill:
   flowRate: 1.0
   speed: 80.0
-  gridSize: 15.0
+  precentage: 20.0
 outerInfill:
   flowRate: 1.0
   speed: 50.0
diff --git a/src/settings/quality.yml b/src/settings/quality.yml
index 967a7b0..1c840bf 100644
--- a/src/settings/quality.yml
+++ b/src/settings/quality.yml
@@ -15,7 +15,7 @@ low:
     speed: 70.0
   innerInfill:
     speed: 80.0
-    gridSize: 25.0
+    precentage: 10.0
 medium:
   title: "Medium"
   layerHeight: .15
@@ -33,7 +33,7 @@ medium:
     speed: 40.0
   innerInfill:
     speed: 80.0
-    gridSize: 25.0
+    precentage: 10.0
 high:
   title: "High"
   thickness:
@@ -51,4 +51,4 @@ high:
     speed: 30.0
   innerInfill:
     speed: 70.0
-    gridSize: 10.0
+    precentage: 20.0
diff --git a/src/sliceActions/generateInfills.js b/src/sliceActions/generateInfills.js
index 3ddfa56..1a777e1 100644
--- a/src/sliceActions/generateInfills.js
+++ b/src/sliceActions/generateInfills.js
@@ -5,7 +5,7 @@ import Shape from 'clipper-js';
 export default function generateInfills(slices, settings) {
   let {
     layerHeight,
-    innerInfill: { gridSize: infillGridSize },
+    innerInfill: { precentage: infillPercentage },
     thickness: {
       top: topThickness,
       bottom: bottomThickness
@@ -13,11 +13,11 @@ export default function generateInfills(slices, settings) {
     nozzleDiameter
   } = settings;
 
-  infillGridSize /= PRECISION;
+  infillPercentage /= 100;
   nozzleDiameter /= PRECISION;
 
-  const bottomSkinCount = Math.ceil(bottomThickness/layerHeight);
-  const topSkinCount = Math.ceil(topThickness/layerHeight);
+  const bidirectionalInfill = infillPercentage < 0.8;
+  const infillGridSize = nozzleDiameter * (bidirectionalInfill ? 2 : 1) / infillPercentage;
   const nozzleRadius = nozzleDiameter / 2;
   const outerFillTemplateSize = Math.sqrt(2 * Math.pow(nozzleDiameter, 2));
 
@@ -32,6 +32,7 @@ export default function generateInfills(slices, settings) {
     }
 
     for (let i = 0; i < slice.parts.length; i ++) {
+      const even = (layer % 2 === 0);
       const part = slice.parts[i];
 
       if (!part.closed) continue;
@@ -52,14 +53,13 @@ export default function generateInfills(slices, settings) {
 
       if (innerFillArea && innerFillArea.paths.length > 0) {
         const bounds = innerFillArea.shapeBounds();
-        const innerFillTemplate = getFillTemplate(bounds, infillGridSize, true, true);
+        const innerFillTemplate = getFillTemplate(bounds, infillGridSize, bidirectionalInfill || even, bidirectionalInfill || !even);
 
         part.innerFill.join(innerFillTemplate.intersect(innerFillArea));
       }
 
       if (outerFillArea.paths.length > 0) {
         const bounds = outerFillArea.shapeBounds();
-        const even = (layer % 2 === 0);
         const outerFillTemplate = getFillTemplate(bounds, outerFillTemplateSize, even, !even);
 
         part.outerFill.join(outerFillTemplate.intersect(outerFillArea));