30.5 to 20mm m4 TPU soft mount bracket
thingiverse
This thing was designed specifically to complement my r1 frame. It's a flight controller soft mount bracket that shrinks from 30.5x30.5mm down to 20x20mm, giving you a flat surface for the Unify Pro vtx when used upside down. To adjust the height as per your setup, use some m3x6 or m3x7 nylon washers or nuts under and over the 30.5 holes. For adding the Unify Pro on top, thin double-sided tape works great. It makes a good match for FC's like the Matek F405 mini or F415 mini.
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