Rings to see what can be made with a single extruder.
The ring with the holes in it is large...4mm on the thicker parts. The diameter is 2.2 cm. It is 7.5mm in height. It was made within 15 minutes. As you can see it didn't came out very smooth. The thinner ring is only 2mm thick. Also a diameter of 2.2cm and it is 4.5mm in height. It took about 5 minutes to print... This print was ok.