add anti-backlash option for solid fill

js/geo-polygons.js

@@ -619,6 +619,9 @@ var gs_base_polygons = exports;
             maxlen = BASE.config.clipper * (maxLen || 0),
             lines = [];
 
+        // store origin as start/affinity point for fill
+        rayint.origin = newPoint(start.x, start.y, start.z);
+
         for (i = 0; i < steps; i++) {
             var p1 = newPoint(start.x - raySlope.dx * 1000, start.y - raySlope.dy * 1000, zpos, NOKEY),
                 p2 = newPoint(start.x + raySlope.dx * 1000, start.y + raySlope.dy * 1000, zpos, NOKEY);

js/kiri-print.js

@@ -496,6 +496,7 @@ var gs_kiri_print = exports;
             fillSpeed = opt.speed || opt.fillSpeed || (firstLayer ? firstFillSpeed || firstShellSpeed : process.outputFeedrate),
             moveSpeed = process.outputSeekrate,
             origin = startPoint.add(offset),
+            antiBacklash = process.antiBacklash,
             z = slice.z;
 
         // apply first layer extrusion multipliers
@@ -566,15 +567,17 @@ var gs_kiri_print = exports;
         }
 
         function outputFills(lines, bounds) {
-            var mindist, p1, p2, dist, point, find, list, len, lastout, pass = 0;
+            var mindist, p1, p2, dist, point, find, list, len, lastout, pass = 0, origin;
+
             while (lines) {
                 list = [];
                 mindist = Infinity;
+                origin = antiBacklash && pass === 0 ? lines.origin : startPoint;
                 // order all points by distance to last point
                 for (i=0; i<lines.length; i++) {
                     point = lines[i];
                     if (point.del) continue;
-                    dist = startPoint.distTo2D(point);
+                    dist = origin.distTo2D(point);
                     list.push({i:i, p:point, d:dist});
                 }
                 if (list.length > 0) {
@@ -590,10 +593,11 @@ var gs_kiri_print = exports;
                         p2 = lines[find.i - 1];
                     }
 
+                    dist = startPoint.distTo2D(p1);
+
                     // mark as used (temporary)
                     p1.del = true;
                     p2.del = true;
-                    dist = startPoint.distTo2D(p1);
                     len = p1.distTo2D(p2);
 
                     // if dist to new segment is less than thinWall
@@ -610,6 +614,11 @@ var gs_kiri_print = exports;
                             retract();
                         }
 
+                        // anti-backlash take out slack by moving toward origin
+                        if (antiBacklash && dist > retractDist) {
+                            addOutput(preout, p1.add({x:1,y:-1,z:0}), 0, moveSpeed);
+                        }
+
                         // bridge ends of fill when they're close together
                         if (dist < thinWall) {
                             addOutput(preout, p1, fillMult, fillSpeed);

js/kiri.js

@@ -100,6 +100,7 @@ self.kiri.license = exports.LICENSE;
                     outputFinishFactor: 1,
                     outputCooling: 1,
                     detectThinWalls: 1,
+                    antiBacklash: 1,
                     outputClockwise: 1,
                     outputOriginCenter: 1,
                     outputInvertX: 1,
@@ -307,6 +308,7 @@ self.kiri.license = exports.LICENSE;
                 outputShortFactor: 0.2,
                 outputFinishFactor: 0,
                 detectThinWalls: false,
+                antiBacklash: false,
                 outputCooling: true,
 
                 // --- LASER ---
@@ -2494,6 +2496,7 @@ self.kiri.license = exports.LICENSE;
             outputShortDistance: UC.newInput("short segment", {title:"segment length cutoff\nfor short segments\nin millimeters", bound:UC.bound(0,200), convert:UC.toFloat, modes:FDM}),
             outputShortFactor: UC.newInput("short factor", {title:"max speed reduction factor\nfor short segments\nas % of print speed", bound:UC.bound(0.05,1), convert:UC.toFloat, modes:FDM}),
             outputFinishFactor: UC.newInput("finish factor", {title:"% of nozzle diameter to\nshorten finish path by\nvalues of 0-1", bound:UC.bound(0.0,1), convert:UC.toFloat, modes:FDM}),
+            antiBacklash: UC.newBoolean("anti-backlash", onBooleanClick, {title: "use micro-movements to cancel\nbacklash during fills", modes:FDM}),
             detectThinWalls: UC.newBoolean("thin wall fill", onBooleanClick, {title: "detect and fill thin openings\nbetween shells walls", modes:FDM})
         });
 

js/license.js

@@ -1,7 +1,7 @@
 var exports = {
     COPYRIGHT:"Copyright (C) 2014-2017 Stewart Allen <stewart@neuron.com> - All Rights Reserved",
     LICENSE:"Unauthorized copying, modification and re-distribution are strictly prohibited without prior written consent.",
-    VERSION:"1.0.94"
+    VERSION:"1.0.95"
 };
 if (!module) var module = {};
 module.exports = exports;