My daughter ordered a blue bed for her dolls, Barbies and other dolls of 1:6 scale.
I made the model quite massive so I had enough space to place connectors once splitt.
At first I tried pegs printed on the one half, but they broke and I had to glue the bed.
Now I choose to use holes on both sides, which should be connected with a ca. 0,1 cm piece of filament, I'd choose PETG over PLA. But you'll probably need glue anyway.
I also add the whole model for you to make your own split and connectors as you need.
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