Remove 6 Philips #2 screws that secure the lower print bed to the upper cover.

When reinserting screws into plastic threads, it's advisable to first turn the screw counterclockwise until it drops into the pre-formed thread. This "click" indicates the correct alignment, allowing you to then screw it in clockwise without cutting new threads, which could potentially strip the plastic and damage the hole.

The turntable belt can now be accessed for cleanup and replacement.

There is a sensitive position-sensing optical ring on the underside of the turntable. Be sure not to damage it with any scraping or fingerprints.