Filament rewinder for prusa filament rolls

This is a Filament rewinder for Prusa rolls.
Its made to be powered by an low rpm electric motor. The main idea is to be able to use the rest of a filament roll, connect both ends together and “make” a new roll. I mainly designed it since we print loads of hand prosthetis and we otherwise would throw the rest of the filament out. Depending on your motor you maybe have to change the diameter of the cog. I use the wheels of a 3D printer as bearings. 

Soon there will be a improved version with press threads. Also there will be added a part for spacing both of the holders. There will also be a photo with it assembled

Cheers