Assuming the Extruder steps per mm is calibrated correctly. If that's PLA, adding a fan to cool it will help it keep its shape. I have an 80mm blowing across the part when I use PLA.
it is indeed PLA - thx for the tip about the fan - I must have missed the bit about extruder steps per mm calibration as that is not ringing any bells
- I will re-read the reprappro Huxley wiki pages again