This a is a Micro Machine scale garage/gas station similar to the IKEA LILLABO garage toy. It has room to place three Micro Machine cars inside and on the roof as well as a ramp to the roof.(cars not included).

The ramp and the base will need supports (for the top of the wedge and the window in the base.
The roof of the garage needs to be glued to the base structure to secure it.
The ramp now attaches to the garage with dovetail joint. Depending on your printer the joint may need some de-burring. You can glue them together or not, so it can be removed from the base garage.