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Merging items are a useful way to adding better design to your levels, one of my favourite things to do is to merge backgrounds for scoreboards to add more detail and decoration.
So here's how you do it:
1 - Place both objects you want merged beside eachother
2 - Place a Material tweaker and tweak the object to be 'Indestructable'
3 - Place a piston from the Left Side of your first object, and connect it to the Left side of your Second Object
4 - Place a battery on the piston and change its Input Action to Forwards - Backwards, then invert the action.
5 - Tweak the piston's minimal distance to 0 and your object should be merged!
It takes some time to get used to but it's a lot less laggier than the original merge tool, and you can do it with 4 people in a level if you wanted to!
Source : LBPCentral