diff --git a/src/mode/fdm/client.js b/src/mode/fdm/client.js
index 02f2fb0a..b37b97a4 100644
--- a/src/mode/fdm/client.js
+++ b/src/mode/fdm/client.js
@@ -36,6 +36,8 @@
             "sliceFillWidth": LANG.fi_wdth_s,
             "sliceFillSparse": LANG.fi_pcnt_s,
             "sliceSolidMinArea": LANG.ad_msol_s,
+            "firstLayerRate": LANG.fl_rate_s,
+            "firstLayerPrintMult": LANG.fl_mult_s,
             // prepare
             "sliceShellOrder": LANG.sl_ordr_s,
             "sliceFillOverlap": LANG.fi_over_s,
diff --git a/src/mode/fdm/prepare.js b/src/mode/fdm/prepare.js
index 76abd079..c53e51ea 100644
--- a/src/mode/fdm/prepare.js
+++ b/src/mode/fdm/prepare.js
@@ -483,17 +483,19 @@
                 let pads = [];
 
                 for (let rec of layer) {
+                    let brate = params.firstLayerRate || firstLayerRate;
+                    let bmult = params.firstLayerPrintMult || firstLayerMult;
                     let point = rec.point;
                     let belty = rec.belty = -point.y + point.z;
                     miny = Math.min(miny, belty);
                     if (layer.anchor) {
                         // apply base rate to entire anchor (including bump)
-                        rec.speed = firstLayerRate;
+                        rec.speed = brate;
                     }
                     if (rec.emit && belty <= thresh && lastout && Math.abs(lastout.belty - belty) < 0.005) {
                         // apply base speed to segments touching belt
-                        rec.speed = firstLayerRate;
-                        rec.emit *= firstLayerMult;
+                        rec.speed = brate;
+                        rec.emit *= bmult;
                         minx = Math.min(minx, point.x, lastout.point.x);
                         maxx = Math.max(maxx, point.x, lastout.point.x);
                         maxy = Math.max(maxy, point.y);