This stool with a turnable top prints with less than 1 kg of filament at ~ 15% infill. It can be assembled using 16-20 4 x 40 mm or longer wood screws and one M5 x 25 (or similar) screw with nut. It requires a 58 x 58 mm wood beam roughly 50 cm in height. If you have some woodworking skills or are willing to scale the model accordingly, other sizes of course also work.  I recommend printing all the spacers at 100% infill, as these take the most load.

The stool has way more holes than reasonably necessary, because I felt like it. It prints almost without support, I recommend only supporting the circular indent in the middle of the two top parts (where the thick spacer is mounted during assembly to enable - somewhat rough - rotation of the top).

The order of assembly of the two top parts is as follows:

nut - spacer 1 - stool top 1 - thick spacer - stool top 2 - spacer 2. 

The long spacer is inserted through all the parts and the M5 screw is inserted through it. Done!