How to fill these gaps!

Wondering how to make this a completed layer, and not stop and start from opposing ends.

This is and attempt to print a wallet with ninjaflex, The nozzle starts at one end. Moves around then stops just before touching the other side!!!

Could you post the base model that you are trying to print as an STL? This sort of sounds like there might be something wonky with the base model that is causing it to slice strangely.