While I was working today, I suddenly got an idea. Since I changed the track structure, I needed a way to give some reinforcement to the part between the ends. In the previous design, I was to be using heavy duty casters. I might as well put some of them to use. With some minor cuts using a good pair of safety glasses and a dremel... I made these.

By cutting off the one side of each caster, they have enough clearance to allow the parts to roll comfortably. The thought is that in the final design it will end up looking something roughly like this. Please note, I am waiting on sprockets to arrive in the mail, so those parts are substituted just to give an idea of the basic shape.

I have also uploaded a current zip file titled "BRAIN". This file contains the current 3D models in 123D and STL format.

Take care!