Summary

Designed to make it easier to change propeller. Last time i had to go back home because could not unscrew the nut ;/

Maybe will help someone and make life easier :)

Pliers - something really strong and durable
Grip - soft TPU
You need to check behaviuour of your TPU filament, some of them turn out realy slicky and may won't work. I have used special filament Noctuo Grip.              -