This floating gear was designed by DragonFly from the MavicPilots forum
. The STL files are available on Thingiverse
if you want to print them at home. Since I do not have a printer I decided to rework them as one part to which I added some trunions in order to add ruber bands around the Mavic to make sure this floating gear could survive a hard impact on water (at least more chance that the mavic would stay along with the floating gear and not sink). The STL file is available for this product in case you want to make further improvement.