Protest Sign 1 Inch Round to Board Adapter

This adapter is designed to insert onto the end of a 1 inch rod (I used a spare part from a curtain rod, but a PVC pipe or dowel would work great!) and connect it to a rectangular piece to support the top of a posterboard protest sign.  

There are two versions; one for a the actual dimensions of a lumber 1x2 cross-beam (a 19.5 mm gap), and one for a 1 inch cross-beam (a 25.2 mm gap; I made it for a strip of foam and wanted it to be tight).  There are two holes and channels so that zip ties or string can be used to fasten the cross-beam to the print, and then the actual sign can be taped to the cross-beam.  

To keep the sign from blowing around, there's a second piece called “lower” - just attach it lower down on the sign and push the main rod through the holes on both of them.  The fit should be tight enough that the sign won't spin on the rod, but if that becomes a problem, the printed material could be taped directly to the rod to help prevent that twisting.

When printing, I'd recommend putting one of the chamfered side faces onto the printer bed (as seen in my screenshot) so that the whole thing prints at a 45 degree angle.  This will allow solid loops of filament to reinforce the stress points of the model, which should make it a lot stronger.  I added some small organic support trees when I printed mine; they probably weren't necessary, but I wanted to ensure that the print didn't get knocked loose.