An outlet cover for 27mm x 27mm x 4mm outlets.
In particular I created this for the this item on amazon
https://smile.amazon.com/KMC-Workshop-Extension-Industrial-Certified/dp/B07P5C62RG?sa-no-redirect=1

When I printed them they snap on and dont fall off, you may have to adjust your scaling appropriately depending on you printers settings.

Print Settings

Printer Brand:

Creality

Printer:

Rafts:

No

Supports:

Resolution:

.3mm

Infill:

Filament:
Generic PLA

Notes:

Category: DIY