Thank again, extreme_sitting, for your feedback on the Aerostruder. I've uploaded a new model (Arm_v2.stl) that has moved the lattice to the bottom. I think it's a better design overall, not only less space taken before the bed (which let me slightly shorten the arm) but also let me improve the lattice a bit. I've not yet printed this, so if you try it let me know how it goes. I hope to print this is the coming days, and if all goes well I'll update photos (etc).