First commit

tools/dremel/scad/reduc_.scad

@@ -0,0 +1,16 @@
+$fn=128;
+
+height=25;
+outer=21;
+inner=20;
+
+difference() {
+    union() {
+        cylinder(h=height,d=outer);
+        cylinder(h=3,d=outer+5);
+    }
+    cylinder(h=height,d=inner);
+    translate([-10,0,height/2]) {
+        cube([10,2,height], center=true);
+    }
+}