It is a recreation of the Lego set 886 Space Buggy as a 3D model. The model is fully designed on Onshape and you can open and copy the Onshape document . Feel free to remix, btw Onshape is free for public models.
By right clicking on the tabs in the Onshape document, you can select export to all sorts of format or just download those that I have attached here.
I suggest you scale it before printing it or it will be rather small. The photo is of a 300% scaled print. Use a bit of support when needed and be creative about which side of the part that faces the plate.
Thanks to Lego for the original design. The CAD documents are all my own creation, the minifig is based on the original patent documents. Some parts are obvious to draw, for some I have been guided by models in the Ldraw library.
The author marked this model as their own original creation.