fix null end layer bug

js/geo-polygon.js

@@ -1050,7 +1050,7 @@ var gs_base_polygon = exports;
         return out;
     };
 
-    PRO.shortestSegmentLength() {
+    PRO.shortestSegmentLength = function() {
         var len = Infinity;
         this.forEachSegment(function(p1, p2) {
             len = Math.min(len, p1.distTo2D(p2));

js/kiri-driver-fdm.js

@@ -357,7 +357,7 @@ var gs_kiri_fdm = exports;
             layer++;
             update(layer / maxLayers);
             // retract after last layer
-            if (layer === maxLayers) {
+            if (layer === maxLayers && layerout.length) {
                 layerout.last().retract = true;
             }
 

js/kiri-print.js

@@ -484,6 +484,7 @@ var gs_kiri_print = exports;
             minSeek = nozzle * (opt.minSeek || 1.5),
             thinWall = nozzle * (opt.thinWall || 1.75),
             retractDist = opt.retractOver || 2,
+            retractDistFill = opt.retractOverSparse || 10,
             retractDistSparse = opt.retractOverSparse || 5,
             fillMult = opt.mult || process.outputFillMult,
             shellMult = opt.mult || process.outputShellMult || (process.laserSliceHeight >= 0 ? 1 : 0),
@@ -606,8 +607,8 @@ var gs_kiri_print = exports;
                         addOutput(preout, p2, fillMult * (find.d / thinWall), fillSpeed);
                         lastout = 1;
                     } else {
-                        // retract if dist trigger and crosses a slice top polygon
-                        if (dist > retractDist && intersectsTop(startPoint, p1)) {
+                        // retract if dist trigger or crosses a slice top polygon
+                        if (dist > retractDistFill || intersectsTop(startPoint, p1)) {
                             retract();
                         }
 

notes.md

@@ -59,6 +59,8 @@
 
 # FDM todo
 
+* use fill spacing for top raft fill spacing
+* add first layer raft offset (addition)
 * fix thin fill
 * add pause at specified layers
 * fix slow seek to first point (raft) and wrong first point in general (all modes)