Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:5437040.

I really liked palimbroseb's design and the 3 plates are excellent and it got me thinking about how I might combine them into one. So keeping the Big Hole version exactly the same as the original, (copied here for convenience) I sliced out an inner plug molded from the full plate version. Then I cut a cap to fit over the center parts. I gave the inverse parts a 0.1mm tolerance around each side to make them fit. For best results, you should use white paint/primer for the plates and a black primer for the plug