This 3D-printed lock accessory holds a balcony door closed using the existing locking pin—without fully locking it. Ideal for smokers or frequent use, it keeps the door shut to prevent drafts while allowing easy opening from the inside. Simple, non-permanent, and practical for everyday use.

This is the second version. Tested for one week. 

The printing file contaings the folowing:
- loking pin part
- loking pin fixation plate

- the door handle. 

To assemble need the folowing:
- threaded inserts M3*3 (3.0h * 4.6 diameter)
- bolts M3*12 ( 12mm long * 3mm wide)

Assembling:
1. insert with solder (heater) the threaded inserts into the fixation plate
 

2. insert assembled plate with (treads) into the corresponding space in the door frame.
3. use the bolts to connect the door locking part with the fixing plate.