[Doug G]

We used 8020 extrusion for the first 3 years on our robots - and it really helps a team to quickly get a base (chassis) up and tested. And if your team lack the ability or skill to weld - this stuffs the ways to go. But be careful, the T-Nuts (gussets), brackets, and hardware can be twice the cost of the aluminum. Get both regular T-Nuts and the drop-in type. We always find a piece to add on and really need those drop-ins!!

We also chose 8020 since you can fit 1/4" carriage bolts (slightly grinded off for a good fit) inside the 1" extrusion. For a quick prototype, this greatly reduces the cost of the hardware. I also heard you can get 5/16" carriage bolts to fit in the BOSCH 30 series extrusion.