Those are some really nice 3 point support brackets! quality on those printed parts is pretty impressive! what kind of 3d printer do you have?
A MendelMax 1.5 with a Buddaschnozzle 1.2 with 0.35 nozzle. I printed the support brackets with 3mm PLA Gold from repraper.com. ABS should be a better option considering the temperatures of the rig.