Paul said batch 4 would have the new arm design but as far as I know they haven’t shipped batch 4 yet and I doubt you could order them till they do. You shouldn’t need the new arms if you use my connector design and a set of 4 arms is quite pricey. However, if you want a modification that is as strong as the batch 4 arm I created yet another design. It requires the hoop pieces to be trimmed a little because the arms are trimmed a little shorter:
Here are the files:
Hoop Connector (Shortened Arm) - Right Tip.stl (317.7 KB)
Hoop Connector (Shortened Arm) - Right Center.stl (253.1 KB)
Hoop Connector (Shortened Arm) - Left Tip.stl (317.7 KB)
Hoop Connector (Shortened Arm) - Left Center.stl (253.0 KB)