This is a wire comb I made for straightening out Cat6A cable before crimping. You put this on your index finger and then pull the wire between your thumb and the comb, along the grooves.
It makes straightening out the wires way easier, especially with this wire because it's 23AWG solid wire. And for crimping it's important that you get the wires very straight before you try and pull them into the connector.
The author marked this model as their own original creation. Imported from Thingiverse.