isw wrote:

If you have some way to make a lot of sawdust (power sander) then do
that, using the cutting board as a source -- it probably could use a
resurfacing anyhow. Mix the dust with epoxy to make a thick paste,
and
work that into the cracks.
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Why waste good epoxy by using garbage fillers?

Micro-balloons are the low cost filler of choice.

They fill without reducing strength.
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"Doug Winterburn" wrote:

All he needs to do is rip it down the center of the glue line on a
tablesaw (or with a guide and a circular saw) and re-glue it.
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Mix some epoxy and micro-balloons to the consistancy of mayo,
then butter both cut surfaces, mush together with hand pressure,
hold in place with spring clmps for 24-48 hours, the remove excess
epoxy and sand flush.

When the board returns to compost, the epoxy will still be in service.

Lew