The author remixed this model.
Dug TechieFenpin's original, so I just scaled it down to regular pen and marker size, making it work nicely for writing utensils. Angled cut added for ease of use and viewing the heart shapes from the front.
If you want a vase, best to stick to the original design here: https://www.printables.com/model/396998-triple-heart-vasepencil-holder