Sticky Piston

It is an actuator for doors, farms and compact machines; include it when a build needs block movement rather than just a signal component.

When it fits: Add it to a redstone project after confirming the moving-block design and its slimeball supply.

The tradeoff: One source recipe run makes 1 and lists 1 Piston, 1 Slimeball at Crafting table; 1 recipe variant(s) for this output are grouped together. Verify access where the pack is incomplete. The recipe uses a piston plus slimeball; it competes for slime in other utility builds and still needs a control circuit.