For next year's Robodojo I'll be making BOB 4 for the full combat fights.

BOB 4 will be an axe bot with interchangeable wedge, snow plough, etc. It'll make a nice back up if the axe breaks in the middle of the fight. This is going to be my first robot with a axe, so it's going to be all trial and error choosing the sprockets, roller chain, steel round bar, etc. I might throw in interchangeable axe heads as well for the fun of it.