Adding silk PLA

scad/Material.scad

@@ -17,6 +17,7 @@ module GreenPLA(alpha=0.52) { color("#1CFF2F", alpha) children(); }
 module PMMA(alpha=0.2) { color("#C8C8C8", alpha=alpha) children(); }
 module GreyPlastic(alpha=1.0) { color("grey", alpha=alpha) children(); }
 module BlackPlastic(alpha=1.0) { color("#303030", alpha=alpha) children(); }
+module DarkBlueSilkPLA(alpha=1.0) { color("#0F0F7F", alpha=alpha) children(); }