ENH: support E3D print parts display

Jira: [STUDIO-14908]
Change-Id: Ie8273eb6f74a3e7508f440d2092bb48f2e1dbb10
(cherry picked from commit a4218e991e6367e3f1ee3802e785802df2ad6d41)

src/libslic3r/CommonDefs.hpp

@@ -16,6 +16,7 @@ namespace Slic3r
         ntStainlessSteel,
         ntTungstenCarbide,
         ntBrass,
+        ntE3D,
         ntCount
     };
 }