Half length Duplo compatible straight train track rails

Half length Duplo compatible straight train track rails with internal printing support structure for easy printing without additional supporting materials. The SCAD-file allows you to make the vertical rail part somewhat thicker and stronger (extrawidth parameter) to more easily support a child standing on it.

Smuk3D made an improved version which gives better results on printers with a higher resolution than my Mendel: http://www.thingiverse.com/thing:196137