Yesterday, alongside the goblet I also managed to slip cast my first tumbler using the three part mold I made last week. This mold worked perfectly and the final piece was much easier to release from the mold and clean up than the goblet. It was all over more structurally sound and I was very happy with the finished product. I have now left it to dry before bisque firing.
With this piece I smoothed down all the inner and top edges with a sponge before taking it out of the mold. This kept the all over strength of the piece. I will be taking this approach with the run of all my final pieces.
This is the piece straight out of the mold with the messy seams.