move draft shield outside of slice loop and start at layer 1

src/kiri-mode/fdm/prepare.js

@@ -551,11 +551,6 @@
                 lastPoly = slice.lastPoly;
                 lastLayer = layerout;
 
-                // draft shield
-                if (brimout && draftShield) {
-                    print.addPrintPoints(brimout, layerout, null);
-                }
-
                 if (layerRetract && layerout.length) {
                     layerout.last().retract = true;
                 }
@@ -572,6 +567,12 @@
                 }
             }
 
+            // draft shield
+            if (layerno > 0 && brimout && draftShield) {
+                print.setType('brim');
+                print.addPrintPoints(brimout, layerout, null);
+            }
+
             // if a declared extruder isn't used in a layer, use selected
             // extruder to fill the relevant purge blocks for later support
             track.slice().forEach(ext => {