Thanks guys, thing about HDPE is as a structural material is it a little soft? i was worred about it mabye bending/warping/ or taking damage easily. I no nylons strong and tough but as mine split its mabye not so good as flexing as i hoped it would be. I'd never use any thing like ali because once thats hit and bent thats it, it'll stay like that. think i may just go for the nylon again but do things a bit different at the front of the robot to make it a little stronger.

god thinking about robots on christmas day, how sads that lol :P