Shelf Lip for 2.5" planks

These are for 3" (in reality 2.5") planks that fit on a pegboard shelf bracket from
szczepanl at https://www.thingiverse.com/thing:2156847

I love the simplicity of these shelves. You can get the pieces of wood at most home improvement stores (got mine at Home Depot) for about a $1 each... but, as much as love my work bench, the shelf can wobble a little bit if the bench gets bumped and everything would come falling off the shelf. So, I made these little lips to attach tightly on the shelf w