Sorry! in English “how did/do you find” something also means what is your opinion on something. I meant to ask what do you think of the driveline, is it strong, easy to lubricate, did the parts fit well? I’ve been thinking of building one
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.