diff -urN pycam-0.6.1.orig/pycam/Gui/OpenGLTools.py pycam-0.6.1/pycam/Gui/OpenGLTools.py
--- pycam-0.6.1.orig/pycam/Gui/OpenGLTools.py	2017-03-11 03:44:32.000000000 +0100
+++ pycam-0.6.1/pycam/Gui/OpenGLTools.py	2017-10-16 19:51:03.776578998 +0200
@@ -91,4 +91,4 @@
     # center the cone
     GL.glTranslatef(0, 0, -cone_length * position)
     # draw the cone
-    GLUT.glutSolidCone(cone_radius, cone_length, precision, 1)
+    GLUT.glutWireCone(cone_radius, cone_length, precision, 1)