The author remixed this model.
I filled in the bottom
My friend broke the phone arm after minutes because it prints standing up, which along with making it slower to print also means its weakest in the direction it will be stressed, when clamping on a phone. To avoid having to print large overhangs when laying it down i decided to fill in the gap underneath it.
Fusion 360 has issues with the way ive fixed the mesh, but it slices and prints fine on my bambu p1s, so it should be fine but maybe theres trouble inbound for some?