I wanted to have a test print which I can use to test the dimensional accuracy of my printer and the print quality of my filaments. But it should also be pretty enough to keep as a color sample afterwards. So I created this  30x30x30 mm  cube which contains several functions.
The print takes about 1.5 hours.
You can check the following properties on this cube:
stringing
bridging (are the bridges over the letter clean, including the large area inside?)
ghosting / ringing
overhangs
dimensional accuracy in all axes
first layer height (is the logo clearly visible on the underside, are there holes in the narrow         areas?)
Was the helix printed neatly with a single wall line?
Are there problems with the Z-seam due to the many retraction?
Was the Z printed neatly on the top?
You can also try breaking out the Y, if that is too easy you may have to reduce the cooling or increase the printing temperature.
Note: The wall thickness of the helix is 0.46mm. If you use a 0.6mm nozzle, the helix may not be sliced. So…