Summary

An add-on to cheap Chineese phone holder. Suitable for Eachine ROTG01 receiver (also for other models/brands with box dimensions 41x60x11mm). Parts printed as shown on stl preview (part D with support) in PLA, layer 0,2mm.
1/4" tripod screw: https://www.thingiverse.com/thing:4005617
Phone holder handle: https://www.thingiverse.com/thing:5776084