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I would like to suggest a small change to the build BOM that will reduce the friction on the stepper motors.
From my little experience, not all 8mm smooth rods are created equal!! There was much resistance on the LM8UU bearings, eventually it wears in, but after many hours of printing, the bearings started to cut a groove into the smooth rods. This cutting into the rods started to cause one of the axis to jitter and eventually stripped the gear. Anyway, during this time I started building another printer, the microcube (thing #1938877) and it called for 8mm tube smooth rod, not solid. For whatever reason, the LM8UU bearings love this tube and slide up and down with no resistance at all. Here is a link to a seller I used for the 8mm smooth tube - http://www.ebay.com/itm/271607850532
I have replaced the 8mm smooth rod with these tubes (also come in good size, no cutting necessary..) and am very happy with how smooth the bed and carriage moves. This will no doubt make life easier ont he steppers. It took about 10 motors before everything was worked in... These tubes could have saved so much work, in my situation. All I had to do to change to them was loosen the nuts holding them in place and I tapped them in with a hammer and that also pushed the old one's out.
If you are ok with it, I'd like to add this to the Wiki in some way, but want your blessing, of course..