it'll be an issue with the slicer settings.
What slicer are you currently using ?
simplify 3d has an option to fill in gaps smaller than the nozzle diameter.
Also see if you can use flashprint: https://www.flashforge-eu.com/info/c...hprint-slicer/

set it for creator pro.
It all depends which motherboard ctc used. Hopefully it's a proper mightyboard (or mightyboard clone). In which case flashprint should work.