An infeed guide roller to keep filament from wearing the aluminum sensor housing, and creating less friction on the feed path from the roller .
Use in conjunction with https://www.thingiverse.com/thing:3059604
Hopefully this is a fun first project for your new CR10S PRO.
Sorry to any original cr10s owners who downloaded this before the pro announcement. heres your version https://www.thingiverse.com/thing:3184808
Set up to drop parts on bed in proper orientation, Use support to bed only for the pin, unless you stand it on end to print.