F550 Retractable Landing Gear

thingiverse

This kind of retractable system is perfect for your hobby: http://hobbyking.com/hobbyking/store/__12883__Digital_Servoless_Retractable_system_1pc_.html - Use it as you see fit! You can also adapt it to other applications, and that's not all, this product is not just about retracts. To make use of the gimbal at the bottom, simply drill a hole where needed and attach with care. Printing four parts is the key here, making the assembly process easier and more enjoyable. A strong bond between the parts can be achieved by gluing them together using epoxy or any other reliable adhesive. For extra weight savings, it's recommended to use approximately 3% infill in your prints.