Simple log cabin made from 10 different pieces. The design is made with FreeCAD. I tweaked the facade and the roof tiles a bit after my own print but they should pose no problem fitting together. In order to build this cabin you need the following amounts of each piece:

Long Beam Bottom Front Half: 1 Long Beam Bottom Back Half: 1 Long Beam: 19 Medium Beam: 5 Short Beam: 17 Long Beam Top Front: 1 Facade: 2 Roof Tiles: 12 Chimney: 1 Ridge 105mm: 2 OR if your printspace is large enough: Ridge 210mm: 1

If you like more windows or 2 small ones instead of a large, you can exchange some long beams by short ones. That would give you two small windows with a central stanchion made out of short beams. Or if you prefer a single small window, use medium beams for the other. Anyway, feel free to create different constructions using these basic building blocks and share your makes.

Makes a great gift for a 4 year old by the way.