[pilleya]

Originally Posted by muffinofsteel

There weren't any viable COTS manipulators to stack the totes.

There were many COTS manipulator systems available to stack the totes.

Just look at Andymark, they came out with tote stacker kit including all the necessary parts. Extrusion just had to be cut to size and assembled

http://www.andymark.com/product-p/am-3098.htm

Vexpro and Competition Robot Parts also had gussets which allowed linear motion

http://www.vexrobotics.com/vexpro/ve...ar-motion.html

http://www.competitionrobotparts.com...elevator-kits/