Design files for this project can be found here
One of the major drawbacks with a fixturing table is that it is difficult to mount a piece of stock in such a way that you have access to the entire top of the stock. With my fixturing table and top-down clamps, a flat piece of stock can be easily secured, but the top-down clamps limit the machinable area. Most CNC machines get around this via a vise mounted to the table, but due to the limited work area of the Roland this was not a feasible approach. Instead, I designed and machined out custom toe clamps to securely and accurately hold parts down from the sides.