From 2a430dc28a36af445a5f1942869a635d7087cb8c Mon Sep 17 00:00:00 2001
From: Alex Selimov <alex@alexselimov.com>
Date: Mon, 21 Sep 2026 22:45:39 -0400
Subject: [PATCH] Update stopper and add a PTFE guide into extrueder

---
 space_pi_se_PTFE_guide.py   | 73 +++++++++++++++++++++++++++++++++++++
 space_pi_se_PTFE_stopper.py | 18 +++++++--
 2 files changed, 87 insertions(+), 4 deletions(-)
 create mode 100644 space_pi_se_PTFE_guide.py

diff --git a/space_pi_se_PTFE_guide.py b/space_pi_se_PTFE_guide.py
new file mode 100644
index 0000000..ff54f22
--- /dev/null
+++ b/space_pi_se_PTFE_guide.py
@@ -0,0 +1,73 @@
+# /// script
+# requires-python = ">=3.14"
+# dependencies = ["ocp_vscode", "build123d"]
+# ///
+
+from build123d import *
+from ocp_vscode import *
+
+### Dimensions ###
+bolt_spacing = 17 * MM
+bolt_hole_diameter = 4 * MM
+z_rod_diameter = 10 * MM
+buffer = 4 * MM
+bolt_to_PTFE_offset = 2 * MM
+base_length = 30 * MM
+bolt_to_holder_offset = 20 * MM
+wall_thickness = 2 * MM
+PTFE_radius = 2.5 * MM
+holder_length = 14 * MM
+
+###################
+
+with BuildPart() as guide:
+    with BuildSketch() as sketch:
+        Rectangle(
+            2 * buffer + base_length,
+            2 * buffer + bolt_spacing + bolt_hole_diameter,
+            align=(Align.MIN, Align.MIN),
+        )
+        with Locations(
+            (buffer + bolt_hole_diameter / 2.0, buffer + bolt_hole_diameter / 2.0),
+            (
+                buffer + bolt_hole_diameter / 2.0,
+                buffer + bolt_hole_diameter / 2.0 + bolt_spacing,
+            ),
+        ):
+            Circle(radius=bolt_hole_diameter / 2.0, mode=Mode.SUBTRACT)
+
+        with Locations(
+            (
+                buffer + bolt_hole_diameter / 2.0,
+                buffer + bolt_spacing / 2.0 + bolt_hole_diameter / 2.0,
+            ),
+        ):
+            Circle(radius=z_rod_diameter / 2.0, mode=Mode.SUBTRACT)
+            Rectangle(
+                z_rod_diameter / 2.0 + buffer,
+                z_rod_diameter,
+                mode=Mode.SUBTRACT,
+                align=(Align.MAX, Align.CENTER),
+            )
+    extrude(amount=wall_thickness)
+
+    with BuildSketch(Plane.YZ.offset(buffer + bolt_to_holder_offset)) as sketch:
+        with Locations(
+            (
+                buffer + bolt_hole_diameter / 2.0 + bolt_to_PTFE_offset,
+                PTFE_radius + wall_thickness,
+            ),
+        ):
+            Circle(
+                radius=PTFE_radius + wall_thickness, align=(Align.CENTER, Align.CENTER)
+            )
+            Circle(
+                radius=PTFE_radius,
+                align=(Align.CENTER, Align.CENTER),
+                mode=Mode.SUBTRACT,
+            )
+
+    extrude(amount=holder_length)
+
+    show(guide)
+export_stl(guide.part, "guide.stl")
diff --git a/space_pi_se_PTFE_stopper.py b/space_pi_se_PTFE_stopper.py
index 15d5a44..f76b70b 100644
--- a/space_pi_se_PTFE_stopper.py
+++ b/space_pi_se_PTFE_stopper.py
@@ -23,14 +23,24 @@ with BuildPart() as stopper:
         Circle(diameter_at_hole / 2.0 + 0.5 * MM)
         Circle(diameter_at_hole / 2.0, mode=Mode.SUBTRACT)
     extrude(amount=ptfe_length)
-    offset = ptfe_length + washer_thickness
-    with BuildSketch(Plane.XY.offset(offset)) as sketch:
+    z_offset = ptfe_length + washer_thickness
+    with BuildSketch(Plane.XY.offset(z_offset)) as sketch:
         Circle(diameter_at_hole / 2.0 + 0.5 * MM)
         Circle(diameter_at_hole / 2.0, mode=Mode.SUBTRACT)
-    offset += filament_length
-    with BuildSketch(Plane.XY.offset(offset)) as sketch:
+    z_offset += filament_length
+    with BuildSketch(Plane.XY.offset(z_offset)) as sketch:
         Circle(diameter_at_filament / 2.0 + 0.5 * MM)
         Circle(diameter_at_filament / 2.0, mode=Mode.SUBTRACT)
     loft()
+    with BuildSketch(Plane.XZ) as sketch:
+        with Locations((0, z_offset)):
+            with BuildLine():
+                l1 = RadiusArc(
+                    (diameter_at_filament / 2.0, 0), (diameter_at_hole / 2, 1), radius=1
+                )
+                offset(amount=0.5 * MM, side=Side.RIGHT)
+            make_face()
+    revolve(axis=Axis.Z)
     show(stopper)
+
 export_stl(stopper.part, "stopper.stl")