I am stuck in virtual land. I won't be getting my springs for a while. I moved back to a concentric mount. I am using 6702 bearings for the central hub. I tweaked a lot of the dimensions so I now can print everywhere in a 200mm diameter by 100mm tall cylinder. You can go much wider and much taller. The max height greater than 150mm. It is actually possible to position the tool beside the build platform. You can theoretically go anywhere on the build platform but it is advisable to stay away from the bolts since there is a singularity there.
I am going to try having the strings just slide over a M8 bolt. I also added a plastic string guide that surrounds the bolt. I think a mechanical advantage of 4-6 will be needed. The math says anything greater than 3 will work.
The most important thing I have done is change the color to yellow. :-)