side-cutter holder added

accessories/cutter_holder.scad

@@ -0,0 +1,13 @@
+difference()
+{
+    cube([20,30,4]);
+    translate([10,20,0])
+        cylinder(d=5.4, $fn=30, h=4);
+}
+
+linear_extrude(10, convexity=10)
+    polygon([[7,0],[10,5],[13,0]]);
+
+translate([0,0,10])
+linear_extrude(2, convexity=10)
+    polygon([[4,0],[10,8],[16,0]]);