My older XY blocks printed in PLA can't take the heat from ABS printing. So it's time to print some new ones. See YouTube Videohttp://youtu.be/VMMDmB5zu-8?list=UUUmGaj_uqlwc7uhsAm0Dr1A
Work from the included Solidworks files if you need to change anything. I originally rebuilt the excellent work from alan89 as a parametric model than changed some features that should help with strength.