added 3D printer files

3Dfiles/README.md

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+# 3D printing files
+
+![](images/3d_1.png)

3Dfiles/dials.scad

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+$fn=100;
+
+single();
+mirror([1,0,0])single();
+
+//color("green")translate([0,22,3])cube([18,44,1],center=true);
+//color("silver")translate([0,(7.5/2)-1.5,1])cube([9,7.5,3],center=true);
+
+module single(){
+    difference(){
+        union(){
+            translate([10.75,2.5,-0.75])cube([6.5,5,6.5],center=true);
+            translate([0,2.5,5])cube([28,5,5],center=true);
+            translate([0,24.25,5.5])cube([10,44.5,4],center=true);
+            translate([0,45.25,2])cube([10,2.5,4],center=true);
+        }union(){
+            translate([9.6,-1,0])rotate([-90,0,0])cylinder(d=2.5,h=10);
+            translate([0,21,3])cube([18.8,44.8,1],center=true);
+        }
+    }
+}