Connector for doors in Kallax shelves

Version 1: single. 
When you make Kallax double-box, with two doors, but so that they open independently. Then the door on one side gets a printed "single" addition, and after closing the second door rests on this addition. 
Screwing “single” addition to the doors back - with the original one screw from the knob, or if you want very rigid - there are holes for additional screws.


Version 2 - when you want to make a double cabinet in height, but with one big door. Two doors make one big and they open together. Then you take the “dual solid” version, screw it to both cabinet doors from the back, and they are connected. 

Version 3 - when you want to make double doors, but opening upwards. Then just connecting the two doors is not enough - because if lifted by one corner they could bend or break. 
You have to connect them and reinforce them with an aluminum angle or something like that - I used a 25x5mm L shape. So the connector “dual” is for the lifting version has cutouts for some reinforcement on back side. 
If you use the original hinges in this position - doors will fall, you need to add pneumatic actuators. But you can use Ikea lifting hinges UTRUSTA - number 504.624.80 white, or 704.624.79 black. 

The models are made to be printable on a Bambulab P1/X1 table 256x256mm, set rotated by 45 degrees, as on attached ready-to-print profiles 3mf. 

When placing hinges on sides - you should use my spacers for kallax without internal box fiom here https://www.printables.com/model/1163676-ikea-kallax-mod-for-solid-door-mount-without-entir