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.