How would I make a part follow another part when it moves, but not have the other part follow this part when it moves?

I want to make a sort of one way weld, when part 1 moves part 2 moves with it, but when part 2 moves part 1 doesn’t move with it. Doing this with a loop (constantly changing part 1’s position to part 2’s position) is too slow and part 1 lags behind.

You can use AlignPosition and AlignOrientation, set it in the part that follows. You can stop it at any time with the Enabled property. Make sure “ReactionForce” is set to false or they part without the alignPosition/orientation will go to the other one as well, if it’s off only the part this those things inside will move. If you move the moving part but don’t turn the AlignPosition/orientation off it will go back so do’t forget.

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AlignPosition
AlignOrientation

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I think that makes part1 move to part2, not make part1 move when part2 moves, like a weld.

It is not like a weld by default, but I think that if you increase some values it will be more like on - not sure.

By defaults is a bit smoother, so try to amp up some values.