plaster fun Free 3D print model

Scale model idea for cement casting.
We aren't going to be printing plastic houses any time soon.
Plastic molds or facades are probably feasible for large format 3D printer owners (builders).
3D printed molds are still expensive using commercial filament.
I'd guess a bit over $100 sqr/mtr for a 3mm mold wall thickness.
Home filament extrudes should drop that by a factor of 5 or more.
While we are dreaming - here is a set of mold parts you can play with.

This is a quick as dirty test. A real project might incorporate some 3D art scans from thingyverse or some 3D objects derived from your stereo photos.