I trimmed some small mugs using porcelain clay ( always a bit of a struggle for me !!!) But today noticed some became almost” impossible “to trim Am trimming without a foot ..... But found that the bottom of the mug started a “ ripple effect( if this the right term ) which continued less than half way down “ Am wondering is this due to 1) not being well centered for trimming ? 2 )Not following the inside shape Or due to some other reason ??
Kind regards Nicky