I really liked the idea behind Urban 3D's awesome slide out Bambu Pull Tray Purge Bucket but needed some changes and saw room for improvement so I redesigned it from the ground up.
It's recommended that you use (2 to 3) 8x3 magnets to secure the tray to the printer.
2023-12-12: Added optional feet for users that have their printer on a rubber paving stone (scale the height according to your mat).