I downloaded a filament guide design from thingiverse when I first got my printer similar to the one listed as a "remix" of but for older Creator Pro. (I couldn't find the original download)
I changed the width of the guide to fit the wider 2016 Creator Pro. I also built in a counter-bore to accept the filament guide tubes and "drill through" matching the ID of the guide tube. Also the bottom of the guide holes are chamfered to ease inserting the filament.
I also upgraded spool holders, see my other models.