WC locks commonly have a turning knob on the inside and a square hole on the outside like shown in this picture. Here is an another example. This design is a handle that will open such door from the outside.

Print Settings

Printer Brand:

Ultimaker

Printer:

Rafts:

No

Supports:

Resolution:

0.2mm

Infill:

Notes:

Wall thickness: 0.8mm

Category: Bathroom