3D Printer Mendel Type X1(X2) extruder/s

I made this printer, but I broke my nerves with dual 3D printing and at the end it was reworked to single extruder printer. 400W Fortron PC ATX PSU was used.
It was with 2 homemade 0,4 nozzle hotends( http://www.thingiverse.com/thing:955315 ) - 70 mm offset, bowden type extruders.
Electronics - Mega2560 + RAMPs 1,4 + Full_Graphic_Smart_LCD_Controller + 6 NEMA 17 motors. Malrin Fimware.
Achieved 0% backlash effect with this type of Z axis + 10 mm tr3 trapezoidal rods.
Working area was: