I've designed my own custom longer rear landing leg to fit my printer (maximum size of 8cm) and still be as long as possible.
As you can see, I like to add a small piece of heat shrink tubing to avoid scratching any surfaces my copter is standing on.
Watch a time-lapse of the print process
Contrary to what you see in my YouTube video, I recommend printing the part standing upright, not lying with the flat side down. This will increase the strength of the little stow nub.