This is my idea for a simple workout bench riser. The risers are made to slide in place of the original rubber feet and are snug by design. The base is slightly larger than the top for a more pyramid like shape. I oriented this on the angled flat side of the outside face away from the hole for (hopefully) more optimal printing. I've included the .stp in case anyone wants to modify for their bench or whatever adjustments they feel.
The author marked this model as their own original creation.