This is a three part retractable nunchuck. It was made to be printed from the beginner printer that I got which has limited print space (10cmx12cmx10cm).

The chains are remixed from RobSoundtrack's Working Nunchaku
https://www.thingiverse.com/thing:2814960

I added a shortened 4 link chain as a personal preference as it felt more comfortable for me. But most people might want to use the 5 link.