Rostock carriage for PTFE linear bearing

Description here: http://eca3d.blogspot.ru/2014/02/rostock-1.html

Modified carriage for 3D printer Rostock (http://www.thingiverse.com/thing:17175).
Design for the elimination of backlash with a homemade 1/2 LM8UU (12 mm) PTFE linear bearing.

For toothed belt with a step of teeth about 2 mm and a width of less than 3.3 mm. For example MXL3.2

Sergey Eremin.