From: Ian Jackson <ijackson@chiark.greenend.org.uk>
Date: Tue, 17 Oct 2023 19:17:10 +0000 (+0100)
Subject: digispark-with-cable: wip progress
X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?a=commitdiff_plain;h=e90ad3a207181a37ae715feb251696b661cf2883;p=reprap-play.git

digispark-with-cable: wip progress

Signed-off-by: Ian Jackson <ijackson@chiark.greenend.org.uk>
---

diff --git a/digispark-with-cable.scad b/digispark-with-cable.scad
index 069c04b..e055eac 100644
--- a/digispark-with-cable.scad
+++ b/digispark-with-cable.scad
@@ -39,6 +39,8 @@ strain_w = 2.0 + 0.5;
 strain_t = 1.0 + 0.5;
 strain_pitch_across = 5;
 strain_pitch_along = 10;
+strain_groove_d = 2;
+strain_groove_w = 3;
 
 // calculated
 
@@ -93,12 +95,28 @@ module TopMainWallsPlan() {
 }
 
 module Top(){ ////toplevel
-  linextr(0, usb_wall_h)
-    TopSmallWallsPlan();
-  linextr(usb_wall_h - usb_ceil_th, usb_wall_h)
-    TopCeilPlan();
-  linextr(-board_th, usb_wall_h)
-    TopMainWallsPlan();
+  difference(){
+    union(){
+      linextr(0, usb_wall_h)
+	TopSmallWallsPlan();
+      linextr(usb_wall_h - usb_ceil_th, usb_wall_h)
+	TopCeilPlan();
+      linextr(-board_th, usb_wall_h)
+	TopMainWallsPlan();
+    }
+
+    for (y_c = [strain_0_y_c, strain_1_y_c]) {
+      for (x_c = [-1,+1] * strain_pitch_across/2) {
+	translate([x_c, y_c, 0])
+	  linextr(-20, 20)
+	  square([ strain_t, strain_w ], center=true);
+      }
+    }
+    linextr_y_xz(total_y_min-1, main_y_min)
+      translate([0, -board_th])
+      scale([1, strain_groove_d/strain_groove_w])
+      circle(strain_groove_w/2, $fn = 8);
+  }
 }
 
 module Bottom(){ ////toplevel