Thread together “catch all tray”  I designed to sit atop one of my desktop PCs so I included optional legs to allow airflow for the CPU radiator.

Print the "sides' upside-down (no supports).

You may need supports under the threaded holes for the feet.  You may be able to bridge it.

The threads don't need support material.  (I replaced the base and foot with an easier thread 1-25-2023)