Kallax extra Shelf Holder

Add an extra shelf to your Kallax shelving unit.
Without damaging the shelving unit!

Only one 16mm board & 4pc 20mm wood screws required.
I used PETG for better UV resistance.

I created a loose fit (16.3 mm)
and a tighter fit (16 mm).
The tighter the fit, the straighter the board stands.

Assembly:

check fit:

It is best to pre-drill now:

Check Screw Size:

Mount 1 piece first:

done