Didn't found a free model of skull-shaped chalice, so I made one myself (kudos for authors of original models I used for this remix!).
Printed with PETG, 0.08 layers, tree-like supports (on plate only). I strongly recommend to enforce 100% infill in the stem with a modifier, like on picture (check 3mf for reference) - it's the weakest part of the model. 15% infill for the rest is enough.
The author remixed this model.
Combined parts of skull by MakerBot into one object… added stem from chalice by Maraktos. Made an opening for drinks in the skull.