I designed a 10cm and 4.5cm leg extension for the Fimi A3 quad/drone. These slide over the built-in feet of the Fimi A3 and clip onto the arm, making them secure during flight, durable for take-off and landing, and easy to slip on and off as desired. Video demo: https://youtu.be/jTGvN-c-NbQ
Video showing some of this drone's capabilities using these legs:https://youtu.be/JZfL-2WZc4k
My main purpose in designing the leg extensions was to allow for ground take-off while carrying a small payload for the DIY port or even a second camera mounted to the bottom. I've done dozens of flights and have not encountered any problems. The long extensions weigh about 6g each.
I used mroek's Fimi X8 extension clips as inspiration to find a safe and easy way to attach these extensions to the A3.
Fimi A3 with 2 batteries: https://www.banggood.com/custlink/3Dm3ZIHt2l
Flush wire cutters: https://amzn.to/2YCmoBP
Print with 15% supports everywhere. Print as oriented and shown.
Remove the supports with flush wire cutters.