diff --git a/src/kiri/app/conf/defaults.js b/src/kiri/app/conf/defaults.js
index 6bd700e4..1efecc0b 100644
--- a/src/kiri/app/conf/defaults.js
+++ b/src/kiri/app/conf/defaults.js
@@ -608,6 +608,7 @@ export const conf = {
                 camTraceLines: false,
                 camTraceMerge: false,
                 camTraceOffOver: 0,
+                camTraceOffZ: 0,
                 camTraceOffset: "none",
                 camTraceOver: 0.5,
                 camTracePlunge: 200,
diff --git a/src/kiri/mode/cam/app/cl-ops.js b/src/kiri/mode/cam/app/cl-ops.js
index df37d770..ad6b364e 100644
--- a/src/kiri/mode/cam/app/cl-ops.js
+++ b/src/kiri/mode/cam/app/cl-ops.js
@@ -485,6 +485,7 @@ export function createPopOps() {
         rate: 'camTraceSpeed',
         plunge: 'camTracePlunge',
         offover: 'camTraceOffOver',
+        offz: 'camTraceOffZ',
         dogbone: 'camTraceDogbone',
         revbone: 'camTraceDogbone',
         ignore: 'camTraceIgnore',
@@ -501,6 +502,7 @@ export function createPopOps() {
         step: UC.newInput(LANG.cc_sovr_s, { title: LANG.cc_sovr_l, convert: toFloat, bound: UC.bound(0.01, 1.0), show: (op) => env.popOp.trace.rec.mode === "clear" }),
         down: UC.newInput(LANG.cc_sdwn_s, { title: LANG.cc_sdwn_l, convert: toFloat, units }),
         offover: UC.newInput(LANG.cc_offd_s, { title: LANG.cc_offd_l, convert: toFloat, units, show: () => env.poppedRec.offset !== "none" || env.poppedRec.mode === "clear" }),
+        offz: UC.newInput(LANG.cc_offz_s, { title: LANG.cc_offz_l, convert: toFloat, units, show: () => env.poppedRec.mode === "follow" }),
         sep: UC.newBlank({ class: "pop-sep", modes: MODES.CAM, xshow: zDogSep }),
         thru: UC.newBoolean(LANG.cc_thru_s, undefined, { title: LANG.cc_thru_l }),
         ignore: UC.newBoolean(LANG.co_igno_s, undefined, { title: LANG.co_igno_l, show: () => env.poppedRec.mode === 'clear' }),
diff --git a/src/kiri/mode/cam/work/op-area.js b/src/kiri/mode/cam/work/op-area.js
index 262ff90d..4c42ee5c 100644
--- a/src/kiri/mode/cam/work/op-area.js
+++ b/src/kiri/mode/cam/work/op-area.js
@@ -256,10 +256,11 @@ class OpArea extends CamOp {
                 progress(proc, 'clear');
             } else
             if (mode === 'trace') {
-                let { tr_over, tr_type  } = op;
+                let { tr_over, tr_offz, tr_type  } = op;
                 let zs = down ? base_util.lerp(zTop, op.thru ? zBottom : Math.max(zBottom, area.minZ()), down) : [ bounds.min.z ];
                 let zroc = 0;
                 let zinc = 1 / zs.length;
+                if (tr_offz) zs = zs.map(z => z - tr_offz);
                 for (let z of zs) {
                     let slice = newLayer(z);
                     let layers = slice.output();
diff --git a/src/kiri/mode/cam/work/op-trace.js b/src/kiri/mode/cam/work/op-trace.js
index cbf3512e..3e1c6d86 100644
--- a/src/kiri/mode/cam/work/op-trace.js
+++ b/src/kiri/mode/cam/work/op-trace.js
@@ -12,7 +12,7 @@ class OpTrace extends CamOp {
 
     async slice(progress) {
         let { op, state } = this;
-        let { areas, direction, down, expand, follow, offover, offset, outline, ignore, mode, ov_botz, ov_topz } = op;
+        let { areas, direction, down, expand, follow, offover, offset, offz, outline, ignore, mode, ov_botz, ov_topz } = op;
         let { plunge, rate, refine, smooth, spindle, step, steps, thru, tolerance, tool } = op;
         let trace = {
             areas,
@@ -40,6 +40,7 @@ class OpTrace extends CamOp {
             tool,
             thru,
             tr_over: offover,
+            tr_offz: offz,
             tr_type: offset
         };
         this.op_trace = new OpArea(state, trace);
diff --git a/web/kiri/lang/en.js b/web/kiri/lang/en.js
index 5c3fdfc3..69254f63 100644
--- a/web/kiri/lang/en.js
+++ b/web/kiri/lang/en.js
@@ -504,6 +504,8 @@ self.lang['en-us'] = {
     cc_thru_l:      ["allow trace depth to extend thru","the bottom of the selected area","use with negative Z bottom"],
     cc_offd_s:      "offset",
     cc_offd_l:      ["overrides default offset distance (which is the tool radius) when set to any value but zero"],
+    cc_offz_s:      "offset z",
+    cc_offz_l:      ["shift add or subtract Z values by this amount","in workspace units"],
     cc_feed_s:      "feed rate",
     cc_feed_l:      ["max cutting speed in","workspace units / minute"],
     cc_plng_s:      "plunge rate",