Render Shadowbox - silhouette frames

Frame design based on the one I encountered with Star Wars Battle Droid Silhouette Ornament by 3DPrintBunny https://www.thingiverse.com/thing:4600786

Renders an empty frame that you can add artwork to.

=========== How to run this code ================
This is an openscad file. The program is open source and available at https://www.openscad.org/downloads.html
Press F5 to refresh. View or WINDOW and uncheck "Hide Customizer" to see customizer input screen.
OpensCAD program F6 to generate/render and then STL export
Slice your STL in your slicer and print

You can also import and manipulate what you want to add. Be sure to place it on the edge without the slot and that you are viewing it from the front of the box when designing... otherwise it will print opposite if you are looking through the back (the side with the slides).

Examples of its use
https://www.thingiverse.com/thing:4933105
https://www.thingiverse.com/thing:4933208

These are the parameters.
//Rend