more designs

pump_rubbers/one-way-rubber.scad

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+inner_hole_dia = 6.5;
+second_dia = 44;
+third_dia = 63;
+outer_dia = 83;
+
+thickness = 3;
+outer_thickness = 7;
+
+$fn=50;
+
+translate([0,0,thickness/2])
+linear_extrude(height=thickness, center=true, convexity=10, twist=0) {
+    difference(){
+        circle(r=second_dia/2);
+        circle(r=inner_hole_dia/2);
+    }
+
+    
+
+    translate([0,-25,0])
+    square(size=[25, 20], center=true);
+}
+
+translate([0,0,outer_thickness/2])
+linear_extrude(height=outer_thickness, center=true, convexity=10, twist=0) {
+    difference(){
+        circle(r=outer_dia/2);
+        circle(r=third_dia/2);
+    }
+}