ELF Drone - Propeller cover (maybe call them drone stabilisers)

I backed the 3D printed drone on Indigogo (https://www.indiegogo.com/projects/elf-the-hd-video-streaming-nano-drone/x/7648351#/story) but I've never owned a drone before so was a little concerned about smashing it in to things and both damaging them and the drone it's self.

So I thought I'd create some removable stabilisers.

This is the first time I've ever created anything in 3D so I'm not sure if these can be printed yet. I have a feeling there might be problems due to some of the angles