The original idea is great. I made it slightly larger with some tabs to reinforce it and shortened the height. Printed with PLA on Ender 3 S1 using Cura 5 with default settings.

There are numerous versions out there. Pick your favorite one.

Edit: I uploaded a new version that fixed a tiny gap in the bottom. It is only a tiny detail and the original file still works as intended.

Print Settings

Printer Brand:

Creality

Printer: 

Ender 3

Rafts:

No

Supports: 

No

Resolution:

2

Infill: 

15

Filament: PLA

Category: DIY