Anycubic S1 Roller Upgrade/Mod

This is to upgrade your OEM filament rollers in the Anycubic Ace Pro machines to allow 250g spools with adaptor side plates to roller smooth. The OEM comes hollow in the middle. This is a quick/cheap way to make them whole again. No need for bearings, new shafts, or new rollers to be printed. Print this insert, clean the ID with a 1/8" drill bit and assemble. Each is about a 14min to print. They spin smooth and fast.