AMS Internal Hub Unit Fix

When (not if) the little plastic cap on the AMS Hub that holds the extrusion wheel, you can buy a new hub or print is ahead of time to replace the cap and be back to printing in no time. You will know it is broken when the AMS will no longer reliably feed to filament all the way to the hot end. After you have checked all the other usual culprits like a piece of filament stuck somewhere in the PTFE path, and are taking the AMS apart, remove the screws holding the Hub onto the main tray and flip is over to check the cap. Take the 4 screws out of it to check if it is broken. (While it is off, blow out the path with some keyboard canned air)