My Vase was inspired by joo's "yet another vase" https://www.thingiverse.com/thing:16378 The idea was good but it always overturned because its top is the opposite of the bottom. I twisted it until its middle and then twisted back its top to the same position like its bottom. This made it much more stable. Print it in vase mode, with 115% initial layer flow and with 0.8 line width and it will hold the water.