Safety Clip to Secure Monitor Riser to Rolling Wire Cart

I've got a monitor shelf on a rolling cart with a wire top. A slight knock could bump the monitor shelf off.

These safety clips, one at each corner, secure the shelf so a slight bump won't knock it off.

Since you probably don't have the same brand of cart and shelf that I do, I've included shelfclip.scad a text file in openSCAD format where you can enter the dimensions of your cart and shelf to get the custom brackets you need.