Drawing Robot Base Slide - Heavy Duty (For Pen Holder)

I'm building the Avanhanegem version of a drawing robot. http://www.thingiverse.com/thing:2058866

I am currently printing all the parts and noticed that the pen holder base slide is in my opinion a bit fragile. This remix strengthens the part that holds the linear shafts on which the pen holder slides on.

Print in ABS for strength. I used supports for the holes but probably didn't need to.

I haven't completed my drawing robot so I'll leave this Thing as a work in progress although I'm fairly sure that it will work fine.