Anti-Drones drop string into other drone's rotors to jam them and cause them to crash. This cap stops the string from entering the rotors. This cap is to be adjusted and customized to fit your drone, have Velcro attached to it, then attached to stop anti-drones from attacking the rotors.
I am currently making an update for this design
Step 1: After 3D-Printing It Add Velcro
This is not mandatory, but works better if you want good results. Add Velcro to any flat areas.
Step 2: After You 3D Print the Design and Add Velcro
Once you 3D print the design (you would've needed to adjust it to the size of the rotor's surroundings) take the part and attach it to the area around the rotor. I would suggest gluing it compared to soldering it.