And it took a whopping 3 hours on my new klippermate, but the job turned out great. After the first 5 or 6 mains I confused myself and unclamped a clamp at the wrong time and botched it and had to start over. That was the only mistake I made though. I definitely think the machine seems good quality. To speed things up, I was wondering if it is ok to tension two strings at a time when doing the mains? I hadn't tried it but I welcome any shortcuts.