Fix Yaxis Cover for Bambulab A1

Problem Solved: This bracket fixes the sagging Bambu A1 Y-axis cover and eliminates the unpleasant noise caused by it. It features three extra ribs for significantly improved stiffness.

Recommendations:

• Material: High-temperature resistant filament is highly recommended.
• Compatibility: Files are included for both old and new hardware revisions.
• Installation: Use glue or double-sided tape to ensure the bracket stays firmly in place.