This video is very early on in the MPCNC family tree, much more aggressive aluminum cutting is now possible. Two major machine revisions have happened and the CAM software has improved dramatically.
Have a look a Kevin's vid, • MPCNC Aluminum Test Cut
https://www.v1engineering.com/
http://www.thingiverse.com/thing:724999
1/8" 2 flute end mill, .3mm DOC, 5 mm/s, 2mm/s plunge. No coolant
6061 Aluminum - took 25 min