nano quadcopter popeller bumper
thingiverse
Should fit the nano quadcopters, works like a charm. You can also customize it.
Download Model from thingiverse
With this file you will be able to print nano quadcopter popeller bumper with your 3D printer. Click on the button and save the file on your computer to work, edit or customize your design. You can also find more 3D designs for printers on nano quadcopter popeller bumper.