I'm changing how I model and making a multi step assembly:

This is similar to just having everything in 1 file but it makes it easier to work on specific components. It also acts as one encompassing "group" since you can't put groups in groups in the timeline. Right now, this allows me to start working on the bed assembly without a finished fibre arm assembly.

Anyway, due to the support hardware for the C5 1605 ballscrews I found (C5 is more precise than C7), and the roller belt I forgot about until I started modelling, my hopes of getting 320mm Z out of a 710mm footprint height are gone, reduced to atoms.

Even without the belt, I don't think the situation would've been much better due to the ballscrew supports anyway. I'm also thinking of using ballscrews for the cartridge axes since they're expected to see >5kg of mass on them.