Find where the failure began: a fold above the base, an outward-dropping rim, a wall that softened during finishing, or the entire pot sliding loose. Each points to a different check. Stop the wheel before inspecting the damaged form.
A fold near the bottom
Look for a thin band above a heavy base. Localized pressure may have weakened that area while leaving weight above it. A cut section of a practice pot can confirm whether the wall has a narrow waist.
On the next pull, gather clay from the lower reserve and keep the upward movement continuous. Pinching at a fixed height can deepen the weak ring. Use a shorter target while you work on that movement.
A rim spreading outward
Inspect speed, hand direction and moisture condition. A thin top that is already opening outward can become increasingly hard to contain. Repeatedly pressing it inward may add a heavy roll above an unsupported section.
Establish a supported wall before widening the shape. Reduce speed as it opens and ease your hands away at the end of contact; a sudden sideways release can disturb an otherwise stable rim.
A shape that softens after many corrections
Repeated water and finishing passes can leave the wall too soft to hold its shape. Think back to the last point at which it stood steadily. If it failed during additional surface work, the next piece may need an earlier stopping point.
Remove pooled water and leave a stable piece supported while it firms. A floppy wall rarely benefits from more wet reshaping. Reclaim a failed practice piece when continued handling only deepens the fold.
The whole mass moved
If clay slides as a unit, investigate attachment rather than wall strength. Stop the wheel and inspect the clay-to-bat connection. Check that the bat itself is firmly seated. Motion of the hardware is a separate issue from clay that has not adhered.
Do not try to catch or restrain a displaced form at speed. Stop safely and clear the work. Inspect the wheel only within the manufacturer’s user-maintenance guidance if the hardware appears loose or uneven.
Questions about this topic
Can I save a collapsed pot by pushing it upright?
Sometimes clay can be repurposed, but a badly folded wet wall is an unreliable base for a finished vessel. Reclaiming a practice piece preserves the opportunity to begin cleanly.
Does collapse prove the clay is bad?
No. Thickness, moisture, support and hand movement all matter. Use an observed pattern across comparable attempts before blaming the clay body.