diff --git a/src/kiri/conf.js b/src/kiri/conf.js
index e7358b0d..20987366 100644
--- a/src/kiri/conf.js
+++ b/src/kiri/conf.js
@@ -249,8 +249,9 @@
 
     let CONF = KIRI.conf = {
         // --------------- helper functions
-        normalize: normalize,
-        device_from_code: device_from_code,
+        normalize,
+        device_from_code,
+        fill_cull_once,
         // ---------------
         MODES: {
             FDM: 1,   // fused deposition modeling (also FFF)
diff --git a/src/kiri/conv.js b/src/kiri/conv.js
new file mode 100644
index 00000000..b9687b71
--- /dev/null
+++ b/src/kiri/conv.js
@@ -0,0 +1,24 @@
+console.log("conf from from cmd line");
+let fs = require('fs');
+var clone = Object.clone = function(o) {
+    return JSON.parse(JSON.stringify(o));
+};
+var self = { kiri: { api: { clone } } };
+
+eval( fs.readFileSync("src/kiri/conf.js").toString() );
+
+let arg = process.argv.slice(2);
+let mode = arg.shift();
+let umode = mode.toUpperCase();
+let lmode = mode.toLowerCase();
+let kiri = self.kiri;
+let conf = kiri.conf;
+for (let file of arg) {
+    let code = JSON.parse(fs.readFileSync(file).toString());
+    let devi = conf.device_from_code(code, umode);
+    conf.fill_cull_once(devi, conf.defaults[lmode].d);
+    delete devi.new;
+    delete devi.internal;
+    delete devi.deviceName;
+    console.log({code, devi});
+}