Shelf brackets for 5mm acrylic shelf

Needed a shelf for the bathroom and I was already ordering some acrylic for my Lack enclosure so it was only a couple of pounds to get some more cut for the shelf.  The 5mm acrylic is sturdy enough for small items; it fits into a slot at each end for neatness. The slot is sized for 5mm x 120mm perspex; 450mm length seems to be OK but I think it'd start to sag if it was much longer.

Print the left and right versions of the bracket and 4 copies of the screw hole cover.