Thanks for your comment, Master.
Yes, these are the arms from FlamenG, they are perfect. The spools 1 and 2 stand on the other side of the USM furniture, just mirrored. All works perfect.
I had not any issues with the prints. I first printed 0.3mm but those prints were not that good so I switched to 0.2. Takes longer but I always print overnight in my office.
Assembly was really easy and it works all just great. You are a genious. Thanks so much, it must have taken many many hours to build and test. I see no improvements, it is just a masterpiece of Engineering.