no support is needed.

Assemby is pretty obvious and you need a little bit of glue.

The body (romp.stl) must be glued upon the hill (belt.stl)
On the hill you should glue the platform (vlonder.stl) and the fence (hekje.stl). But they are not absolutely necessary.

The windmill blades have a separate axe, That way I could print it nicely without support. The axe should be glued into the blades.

the 'hood' of the mill (kap.stl) is its most complex part. You should glue the 'tail' (staart.stl) and the remstok.stl in the obvious places.
Put the axe of the blades in the hood. Don't glue it.
Hood is placed without glue on the body.

So blades and hood both can rotate.