Print from cloudy or transparent PETG, with supports. Play around with the infill settings to get a nice pattern to show through. Or use whatever color you want. I'm not your Mom. But the cloudy I used lets a little light through, so that's nice.

Couldn't find a replacement for the screen door slider in my RV. The part that slides over to block the hole when you disengage the screen door from the solid door. Remove the old one, and the block piece as well, and then install this one. I had to remove a couple screws from the door to get it apart far enough to wedge this in, then put the screws back.

Works great, and… seems more durable than the original. If I get around to it I may adjust the curve right where it meets the door handle block, but it works just fine without it so I may never get around to it.