Hard to know how to approach this without knowing more, and seeing a 
picture. I expect it was an expensive table, and relatively new. If so, 
I'd definitely be talking to the dealer or manufacturer about resolving 
the problem before even considering outside help. Was the board a bad 
choice for the table? Was the epoxy an appropriate solution?

If the epoxy didn't hold, the movement may not be done yet. Did the 
table experience a change in climate? Has the table settled down, or is 
the wood still moving, widening the crack?

Probably a mechanical connection is required, a butterfly key for 
example?. Even a steel mending plate or two down below may be in order. 
What's appropriate really depends upon a number of factors, not least 
the style and finish level of the table. A fancy period reproduction 
will require a different approach than a modern piece, for example.

FWIW
Don


On 2022-06-16 10:55 a.m., Micah Salb via groups.io wrote:
> Folks:
>
> A friend purchased a very large walnut dining table constructed of long 8"
walnut boards.  One of the boards had a split at the end (the grain there was
basically rift-sawn).  The split was filled with dyed epoxy.  But the epoxy has
separated from one side; there is a minute gap between the wood and the epoxy
and the wood is very slightly elevated (not really visibly so but you can feel
it with your hand).
>
> At my urging, my friend got a quote from a large very experienced restoration
company.  They said it would cost $1,200 and would have to be fixed in their
shop.  My friend is wondering how much to quarrel with the table's manufacturer.
>
> How much should he be worried about this?  (I'm concerned that continued
expansion and contraction will make the problem much worse, but perhaps it
wouldn't cause so much harm that it couldn't still be fixed?)
>
> Micah
>
>
> 
>
>

-- 

God's away on business - Tom Waits

"...it's just a humpty dumpty world" - Ry Cooder