diff --git a/notes.md b/notes.md
index 02d9056b..4294bec1 100644
--- a/notes.md
+++ b/notes.md
@@ -123,3 +123,7 @@
 * https://users.cs.jmu.edu/buchhofp/forensics/formats/pkzip.html
 * https://en.wikipedia.org/wiki/ZIP_(file_format)
 * https://stuk.github.io/jszip/
+
+# Meta
+
+* free-space tetrahedron modeler with vertex mating
diff --git a/src/dev/fdm/Wanhao.Duplicator_4s b/src/dev/fdm/Wanhao.Duplicator_4s
index e5aca36d..2c9c6c59 100644
--- a/src/dev/fdm/Wanhao.Duplicator_4s
+++ b/src/dev/fdm/Wanhao.Duplicator_4s
@@ -11,7 +11,6 @@
         "G1 Z0.25 F180       ; move z to 0.25mm over bed",
         "G92 E0              ; zero the extruded",
         "M109 S{temp} T{tool}     ; wait for extruder to reach target temp",
-        "G1 E15 F200         ; purge 15mm from extruder",
         "G92 E0              ; zero the extruded",
         "G1 F225             ; set feed speed"
     ],
diff --git a/src/dev/fdm/Wanhao.Duplicator_5s b/src/dev/fdm/Wanhao.Duplicator_5s
index 280adb3b..67fa5433 100644
--- a/src/dev/fdm/Wanhao.Duplicator_5s
+++ b/src/dev/fdm/Wanhao.Duplicator_5s
@@ -11,7 +11,6 @@
         "G1 Z0.25 F180       ; move z to 0.25mm over bed",
         "G92 E0              ; zero the extruded",
         "M109 S{temp} T{tool}     ; wait for extruder to reach target temp",
-        "G1 E15 F200         ; purge 15mm from extruder",
         "G92 E0              ; zero the extruded",
         "G1 F225             ; set feed speed"
     ],
diff --git a/src/dev/fdm/Wanhao.Duplicator_6 b/src/dev/fdm/Wanhao.Duplicator_6
index 54bf135d..7a73d2b5 100644
--- a/src/dev/fdm/Wanhao.Duplicator_6
+++ b/src/dev/fdm/Wanhao.Duplicator_6
@@ -11,7 +11,6 @@
         "G1 Z0.25 F180       ; move z to 0.25mm over bed",
         "G92 E0              ; zero the extruded",
         "M109 S{temp} T{tool}     ; wait for extruder to reach target temp",
-        "G1 E15 F200         ; purge 15mm from extruder",
         "G92 E0              ; zero the extruded",
         "G1 F225             ; set feed speed"
     ],
diff --git a/src/dev/fdm/Wanhao.Duplicator_i3 b/src/dev/fdm/Wanhao.Duplicator_i3
index 54bf135d..7a73d2b5 100644
--- a/src/dev/fdm/Wanhao.Duplicator_i3
+++ b/src/dev/fdm/Wanhao.Duplicator_i3
@@ -11,7 +11,6 @@
         "G1 Z0.25 F180       ; move z to 0.25mm over bed",
         "G92 E0              ; zero the extruded",
         "M109 S{temp} T{tool}     ; wait for extruder to reach target temp",
-        "G1 E15 F200         ; purge 15mm from extruder",
         "G92 E0              ; zero the extruded",
         "G1 F225             ; set feed speed"
     ],