I found this on another forum http://www.amazon.com/RETRAX-Retractable-Landing-Gear-quadcopter/dp/B00KQQX20S It is a bit on the heavy side but the price is right.
F450 Retractable Landing Gear
- Thread starter SanCap
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It's heavy partially because it's FDM. It needs to have thick shells and a number of connection points to distribute stress because of the possibility of delamination. I have 3r printed parts on my landing gear as well but it's sintered nylon and quite a bit tougher.
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