Rostock build

I have begun printing the parts for a Rostock printer, I tried printing the rods in both PLA and ABS to see if either were suitable, ABS warped horribly and the rod turned out more like a banana, the PLA one did come out straight once cooled but was far too flexible in my opinion to be useful, so I will probably take the alternative option for the rods and use a stiff rod of some sort and just print the ends and glue them on, I have a long length of glass fiber rod (in the days before carbon fiber this was the best stiffest rod you could get)  if I can find it I will use this for the rods.