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From The Great Ball Contraption Wiki

A clot is a situation where balls fail to move downstream because they are stuck against each other. Frequently occurs when the flow goes from a wider to a narrower area (such as in a funnel), around a bend, or down a shallow slope. Prevention of clots is a key issue that must be addressed with in baskets, because many lift mechanisms require a narrower feed than the 8-stud width of the standard in basket.[1]

Examples of Use[edit]

Related and Alternate Terms[edit]

  • jam, especially ball jam
  • blockage


  1. The Great Ball Contraption: Ideas under the heading "Hopper Busters".
Facts about "Clot"