Funny. I stopped drink energy drinks few years ago. I started going night shifts, and I used energy drinks and coffee. Then, I once said to myself I don't like the taste of energy drinks. I stopped drink energy drinks just in one day. Never have then since. Five years and still counting.
On the other side, I started slightly drink more coffee.
Driveline is no need to lubricate, because it's belt drive system(at least in Model 7). Parts fit well, bearings, belts etc (although, that depends on how well calibrated is your printer). I think that system is strong enough. I built it with brushless motor and it's wild.
Only challenging parts were ball joints. I had problems to fit them in place, but I found a way.
Very much. Can print bigger projects, or smaller one with more parts on the same plate (for example, rims for rc car, which is technically part of the bigger project)
If this happen to me, I'm the who will round around hall and get machines ready for production