more designs

pump_rubbers/piston_rubber.scad

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+main_inner_dia = 60;
+main_outer_dia = 70;
+inner_dia_small = 40;
+height = 15;
+
+thickness = (main_outer_dia - main_inner_dia)/2;
+
+inner_radius = 2;
+outer_radius = inner_radius + thickness;
+
+extra_size = (main_inner_dia - inner_dia_small) / 2 - inner_radius;
+
+module ring(inner_radius, outer_radius){
+    difference(){
+        circle(r=outer_radius);
+        circle(r=inner_radius);
+    }
+}
+
+module quarter_ring(inner_r, outer_r,){
+    difference(){
+        ring(inner_r, outer_r);
+        difference(){
+            square(size=[2*outer_r, 2*outer_r], center=true);
+            translate([0,-outer_r,0])
+            square(size=[outer_r, outer_r], center=false);
+        }
+    }
+}
+
+rotate_extrude(convexity=10, $fn=100) {
+    translate([main_inner_dia/2,0,0]){
+        union(){
+            square(size=[thickness, height]);
+            translate([-inner_radius,0,0])
+            quarter_ring(inner_radius, outer_radius);
+            translate([-extra_size-inner_radius,-thickness-inner_radius,0])
+            square(size=[extra_size, thickness]);
+        }
+    }
+}