shelf leveler

I bought "Seville Classics 2-Tier Iron Mesh Adjustable Floating Wall Shelves, 36″ x 14″, Satin Pewter" from Amazon. They're nice mesh shelves, but the manufacturing tolerances are way, way off and the shelves tilt dangerously downward. There's details here:

https://www.risley.net/rnwp/index.php/2018/04/29/fixing-shelves/

This is a very simple part, designed in FreeCAD. They are spacers (you'll need four) that slide onto the shelf bracket and move the shelves to a more horizontal position.