UPDATE Landing Gear is a success! Very strong. be sure to acetone treat the legs for optimal strength. land too hard, and you will bend the frame. i took a 5ft landing drop on grass carrying a gopro without damage! The R10 Quadrotor came with terrible landing gear, so i decided to make my own modification. This is a 3d Print tested part, and the hole sizing should be just about perfect for you. i sliced in cura, and printed at 20% Infill. It uses the same bolts that comes with the R10, just unbolt, and bolt these On! The nut is captive, so you don't need anything but an allen key. More parts for this quadrotor to come, including battery relocation mount, and Go Pro Hero 3 Mount and a Ultrasonic Sensor relocation mount. I designed this in OpenSCAD which i know nothing about, but am trying to learn.Instructions: Print Two Regular, Print Two Mirrored. Attach to quadrotor and use 8MM Shafts of the length you prefer. I used 8mm carbon shafts and it works great! The Feet are still a prototype, but are very strong, again designed for 8mm shafts (actual diameter 7.75mm)