Printed with a pause at layer 46, to fill it with some small-grained rice. Choose an infill pattern that allows you to fill it up top-to-bottom, like triangles.

Print the two parts separately. You probably don't need supports for the cutout in the LEGO® compatible element. 

There are no tolerances in the STL files! If you print it with the same printer and the same filament, the two pieces should fit tightly together and never move again. Some force may be required, but be careful to apply it only in directions that don't snap off the stilt from the base.

Use the Blender file to create different poses for the LEGO® compatible element. Export each object and tick the “selection only” and “apply modifiers” checkboxes.