diff --git a/src/mode/fdm/export.js b/src/mode/fdm/export.js
index 23110dd0..618bb466 100644
--- a/src/mode/fdm/export.js
+++ b/src/mode/fdm/export.js
@@ -76,10 +76,12 @@
             originCenter = process.outputOriginCenter || device.bedRound,
             offset = originCenter ? {
                 x: 0,
-                y: 0
+                y: 0,
+                z: 0
             } : {
                 x: device.bedWidth/2,
-                y: isBelt ? 0 : device.bedDepth/2
+                y: isBelt ? 0 : device.bedDepth/2,
+                z: 0
             },
             nozzleTemp = process.firstLayerNozzleTemp || process.outputTemp,
             bedTemp = process.firstLayerBedTemp || process.outputBedTemp,
@@ -127,8 +129,9 @@
             palettePingSpace = paletteInfo.ping || 0,
             segments = [],
             // track purges for palette3 pings
-            purgeOff = 0,
-            purgeOn;
+            purgePos,
+            purgeOn = 0,
+            purgeOff = 0;
 
         // smallish band-aid. refactor above to remove redundancy
         function updateParams(layer) {
@@ -183,11 +186,6 @@
         }
         let loops = isBelt && rloops.length ? rloops : undefined;
 
-        // (process.gcodePauseLayers || "").split(",").forEach(function(lv) {
-        //     let v = parseInt(lv);
-        //     if (v >= 0) pause.push(v);
-        // });
-
         append = function(line) {
             if (line) {
                 lines++;
@@ -346,7 +344,11 @@
 
         function pushPos(newpos, rate, comment) {
             savePos = Object.clone(pos);
-            moveTo(newpos, rate, comment);
+            moveTo({
+                x: newpos.x + offset.x,
+                y: newpos.y + offset.y,
+                z: newpos.z + offset.z
+            }, rate, comment);
         }
 
         function popPos(rate, comment) {
@@ -354,6 +356,15 @@
         }
 
         function moveTo(newpos, rate, comment) {
+            if (pingRemain) {
+                if (newpos.e) {
+                    if (pingRemain - newpos.e < -0.4) {
+                        // split move if ping over-extrudes? complicates emitted calc.
+                        // console.log({over_ping: pingRemain - newpos.e});
+                    }
+                    pingRemain -= newpos.e;
+                }
+            }
             let o = [!rate && !newpos.e ? 'G0' : 'G1'];
             let emit = { x: false, y: false, z: false };
             if (typeof newpos.x === 'number' && newpos.x !== pos.x) {
@@ -419,7 +430,8 @@
         }
 
         // calc total distance traveled by head as proxy for progress
-        let allout = [], totaldistance = 0;
+        let allout = [];
+        let totaldistance = 0;
         layers.forEach(function(outs) {
             allout.appendAll(outs);
         });
@@ -427,6 +439,9 @@
             totaldistance += o1.point.distTo2D(o2.point);
         }, 1);
 
+        // for palette pings, amount of extrusion left
+        let pingRemain = 0;
+
         // retract before first move
         retract();
 
@@ -517,23 +532,25 @@
                 // do not generate pings before total tube length exhausted
                 // because the palette cannot respond to differences before then
                 if (isPalette && palettePingSpace && emitted >= palettePingStart) {
-                    if (out.point.purgeOn && (purgeOff === 0 || emitted - purgeOff >= palettePingSpace)) {
+                    if (purgeOn === 0 && out.point.purgeOn && emitted - purgeOff >= palettePingSpace) {
                         retract();
-                        if (isBelt) pushPos({x:195});
+                        pushPos(out.point.purgeOn);
                         append(`G4 P4000`); append('G1');
                         append(`G4 P4000`); append('G1');
                         append(`G4 P4000`); append('G1');
                         append(`G4 P1000`);
-                        if (isBelt) popPos();
+                        popPos();
                         unretract();
                         purgeOn = emitted;
+                        purgePos = out.point.purgeOn;
+                        pingRemain = 20;
                     }
-                    if (purgeOn && out.point.purgeOff) {
+                    if (purgeOn && pingRemain <= 0) {
                         retract();
-                        if (isBelt) pushPos({x:195});
+                        pushPos(purgePos);
                         append(`G4 P4000`); append('G1');
                         append(`G4 P3000`);
-                        if (isBelt) popPos();
+                        popPos();
                         unretract();
                         if (!print.purges) {
                             print.purges = [];
@@ -544,6 +561,7 @@
                         });
                         purgeOff = emitted;
                         purgeOn = 0;
+                        pingRemain = 0;
                     }
                 }
 
diff --git a/src/mode/fdm/prepare.js b/src/mode/fdm/prepare.js
index d3da3f88..a1ee7d2c 100644
--- a/src/mode/fdm/prepare.js
+++ b/src/mode/fdm/prepare.js
@@ -299,7 +299,8 @@
                     diameter: exi.extNozzle,
                     rect,
                     full,
-                    sparse
+                    sparse,
+                    pause: newPoint(pos.x + walkpos.y, pos.y + walkpos.x, pos.z)
                 };
             return rec;
         }
@@ -357,13 +358,19 @@
                     wipe = false;
                 }
                 let box = rec.rect.clone().setZ(z);
+                let pause = rec.pause.clone().setZ(z);
                 let fill = (z >= 0 && purgeOn ? rec.full : rec.sparse).clone().setZ(z);
                 if (isBelt) {
-                    box.move({x:0, y:z, z:0});
-                    if (fill) fill.move({x:0, y:z, z:0});
+                    let bmove = {x:0, y:z, z:0};
+                    box.move(bmove);
+                    pause.move(bmove);
+                    if (fill) {
+                        fill.move(bmove);
+                    }
                     if (offset) {
                         let bo = { x:0, y:offset.y, z:offset.z };
                         box.move(bo);
+                        pause.move(bo);
                         if (fill) fill.move(bo);
                     }
                 }
@@ -375,12 +382,13 @@
                     onfirstout: (out => out.overate = (isBelt ? rate : 0))
                 });
                 if (fill && fill.length) {
+                    // for pings, split path at 20mm
                     start = print.polyPrintPath(fill, start, layer, {
                         tool,
                         rate,
                         simple: true,
                         open: true,
-                        onfirst: (point) => { point.purgeOn = purgeOn }
+                        onfirst: (point) => { point.purgeOn = purgeOn ? pause : undefined }
                     });
                 }
                 layer.last().retract = true;
@@ -393,7 +401,6 @@
                     extrude: 0
                 });
                 layer.last().overate = 0;
-                start.purgeOff = purgeOn;
                 return start;
             } else {
                 console.log({no_purge_tower_for: nozzle, using, track, layer});