Pot shape
You're drawing the pot upright — rim at the top. Each dot sets the width at that height. The pot must stay as wide or get wider toward the rim so the cast releases from the mold.
⚠ Undercut: a point is wider than the profile above it, so the cast piece can't slide out of a one-part mold. Pull the red dot(s) inward.
Print all parts (0.2 mm layers, 3+ walls). Assemble on the base plate, clip the cottle fins, seal seams with clay, coat the form with mold soap, pour pottery plaster #1, demold when set, and let the plaster mold dry fully before slip casting.