On 20/01/2019 13:05, Andy Burns wrote:
Bob Minchin wrote:

Almost anything 2mm thick and 700mm long will not be stiff enough to
stop is pinging out of the slots when the centre flexes

Surely the dividers will be arranged in a grid, with cross-halving joints?

or glue on anything going spare as stiffeners so long as they stop short
of the slots? possibly "braced" vertically too?

--
Robin
reply-to address is (intended to be) valid