Latch

A door latch with a slider.
Print the slide insert and slide guide vertical to ensure a maximum in strenght.
The large plate is not needed, but in my case I needed to fill a difference between the height of the door and the height of the frame.
Print in 100% infill to make the latch stronge.

16 June 2019 Update
After adding the latch to the door, I noticed that there can be a potentional problem.
The latch slides realy smoothly and when the latch is mounted on the door, the latch might slide into a lock position when slamming the door closed. To overcome this I added a magnet and an additional screw to the latch. Now the latch stays into the open position and it doesn't matter how hard the door will be swinged.
Use a round magnet of 8mm by 3mm and a 3,5cm 3.0 screw to place into the middle hole.

Magnet on Ebay: 10 pcs N35 Strong Round Disc Rare Earth Neodymium Magnets 8 x 3 mm (0.3 x 0.12") for around $2.5