Rostock MAX 250mm Calibration Cylinder

thingiverse

If you want to figure out whether your printer is capable of doing a decent tall print, but you want proof that it's capable of doing so before you spend $10 worth of filament, you should use a calibration piece like this cylinder. It will print as a 25cm (~10") vase. The Rostock will do about 36cm with the stock and some other hot ends, so you can scale it up if you want to test the full height, although the stuff that's likely to go wrong (bad delta rod length or printer radius setting in Configuration.h) will have done so by 25cm in my experience. Slice as a vase.