Can I adjust the pressure to mill different materials?
Yes there are screws on the mill that adjust to vary the pressure of the pressure wheel for different materials. There seems to be a "feel" you will need to develop to make good pellets. We will have formulas for you to use as we receive them the pellet mill community.

What are the 3hp pellet mill's dimensions?
Overall dimensions are 29"h x 12w x 30" to the top of the hopper. The weight is about 125 pounds. The wooden crate it ships in is a little bigger length and width, but the height is shorter because the funnel on top comes off. Also the wheels are removed for shipping.