diff --git a/src/kiri-mode/cam/export.js b/src/kiri-mode/cam/export.js
index 5f3a1d5e..d86af3f7 100644
--- a/src/kiri-mode/cam/export.js
+++ b/src/kiri-mode/cam/export.js
@@ -45,7 +45,7 @@ CAM.export = function(print, online) {
         cmdToolChange = device.gcodeChange || [ "M6 T{tool}" ],
         cmdSpindle = device.gcodeSpindle || [ "M3 S{speed}" ],
         cmdDwell = device.gcodeDwell || [ "G4 P{time}" ],
-        axis = { X: 'X', Y: 'Y', Z: 'Z', A: 'A', F: 'F'},
+        axis = { X: 'X', Y: 'Y', Z: 'Z', A: 'A', F: 'F', R: 'R' },
         dev = settings.device,
         spro = settings.process,
         maxZd = spro.camFastFeedZ,
@@ -257,10 +257,9 @@ CAM.export = function(print, online) {
         console.log(out)
         let gn;
         if ( out.emit >=0 && out.emit <= 3) gn = `G${out.emit}`;
-        else throw new Error(`malformed emit type ${out.emit}`);
-
         let speed = out.speed,
         arc = out.emit == 2 || out.emit == 3,
+        radius = out.radius,
         nl = (compact_output && lastGn === gn) ? [] : [gn],
         dx = opt.dx || newpos.x - pos.x,
         dy = opt.dy || newpos.y - pos.y,
@@ -305,6 +304,9 @@ CAM.export = function(print, online) {
             pos.f = feed;
             nl.append(space).append(axis.F).append(add0(consts.feed = feed * factor, true));
         }
+        if(arc){
+            nl.append(space).append(axis.R).append(add0(radius * factor, true));
+        }
 
         // temp hack to support RML1 dialect from a file extensions trigger
         if (isRML) {