Had to scale down to 80% to fit my printer. Worked perfectly.
Thank you so much!
Update: I've redone the garagedoors, as they where to hard to move. I've scaled them down by 1mm in width. Now they close by gravity, but my son is happy.
As the CA glue took to long to dry ("I wanna play NOW!") i looked around, and fixed everything with my soldering iron set to 240°C.
As doorhandle for the small door and also the hinges of the garagedoor i used a piece of filament, also soldered into place.