diff --git a/src/kiri-mode/fdm/export.js b/src/kiri-mode/fdm/export.js
index cc08b398..3539c265 100644
--- a/src/kiri-mode/fdm/export.js
+++ b/src/kiri-mode/fdm/export.js
@@ -132,6 +132,12 @@
             purgeOn = 0,
             purgeOff = 0;
 
+        let tools_used = Object.keys(print.tools);
+        for (let tool of tools_used) {
+            subst[`tool_used_${tool}`] = true;
+        }
+        subst.tool_count = tools_used.length;
+
         // smallish band-aid. refactor above to remove redundancy
         function updateParams(layer) {
             let params = getRangeParameters(process, layer);
@@ -204,8 +210,31 @@
             appendSub(line, true);
         }
 
+        let subon = true;
+        let ifhit = false;
+
+        // eval() based var substitution (from print)
+        // with logic flow IF / ELIF / ELSE / END
+        // IF / IF is valid but will not nest
         function appendSub(line, pad) {
-            append(print.constReplace(line, subst, 0, pad));
+            if (line.indexOf(';; IF ') === 0) {
+                line = line.substring(6).trim();
+                let evil = print.constReplace(line, subst, 0, 666);
+                subon = evil;
+                ifhit = subon;
+            } else if (line.indexOf(';; ELIF ') === 0) {
+                line = line.substring(6).trim();
+                let evil = print.constReplace(line, subst, 0, 666);
+                subon = !subon && evil;
+                ifhit = ifhit || subon;
+            } else if (line.indexOf(';; ELSE') === 0) {
+                subon = !ifhit && !subon;
+            } else if (line.indexOf(';; END') === 0) {
+                subon = true;
+                ifhit = false;
+            } else if (subon) {
+                append(print.constReplace(line, subst, 0, pad));
+            }
         }
 
         function appendAll(arr) {
@@ -244,7 +273,6 @@
         }
         append("; --- process ---");
         for (let pk in process) {
-            // append("; " + pk + " = " + process[pk]);
             appendTok("; ", pk, " = ", process[pk]);
         }
         append("; --- startup ---");
diff --git a/src/kiri/print.js b/src/kiri/print.js
index 5d065f03..52eaaf47 100644
--- a/src/kiri/print.js
+++ b/src/kiri/print.js
@@ -27,6 +27,7 @@
         lastE,
         lastPos,
         nextType,
+        tools = {},
         debugE; // set to 1 to enable flow rate analysis (console)
 
     KIRI.Print = Print;
@@ -36,6 +37,7 @@
         lastEmit = null;
         lastOut = null;
         lastPos = null;
+        tools = {};
         return new Print(settings, widgets, id);
     };
 
@@ -49,6 +51,7 @@
         this.settings = settings;
         this.widgets = widgets;
         this.setType = setType;
+        this.tools = tools;
         debugE = settings ? (settings.controller.devel ? 1 : 0) : 0;
     }
 
@@ -420,6 +423,7 @@
             this.speed = speed;
             this.tool = tool;
             this.type = type;
+            if (tool !== undefined) tools[tool] = true;
         }
 
         clone(z) {
@@ -1295,11 +1299,15 @@
             tok = str.substring(cs+1,ce);
             let eva = [];
             for (let [k,v] of Object.entries(consts)) {
-                if (typeof v === 'number') {
-                    eva.push(`let ${k} = ${v};`);
-                } else {
-                    if (v === undefined) v = '';
-                    eva.push(`let ${k} = "${v.replace(/\"/g,"\\\"")}";`);
+                switch (typeof v) {
+                    case 'number':
+                    case 'boolean':
+                        eva.push(`let ${k} = ${v};`);
+                        break;
+                    default:
+                        if (v === undefined) v = '';
+                        eva.push(`let ${k} = "${v.replace(/\"/g,"\\\"")}";`);
+                        break;
                 }
             }
             eva.push(`function range(a,b) { return (a + (layer / layers) * (b-a)).round(4) }`)
@@ -1307,6 +1315,9 @@
             let scr = eva.join('');
             let evl = eval(`{ ${scr} }`);
             nutok = evl;
+            if (pad === 666) {
+                return evl;
+            }
             if (pad) {
                 nutok = nutok.toString();
                 let oldln = ce-cs+1;