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Hi Michael,
They do require a little assembly. Those little holes you’ll find are the same diameter as standard PLA filament (1.75mm) so you can cut short lengths of spare filament to act as a pin to secure the two pieces together. I glue in a short piece of filament, then once the glue is dry trim it to the correct depth for the corresponding hole on the other piece, typically they only need to be 3-4mm in length. You’ll still need to glue the parts of the building together, which we recommend using super glue.