This is a single-sided D1. No matter how you roll it, it will always land on the same side, because there is only one side (a mobius strip). There's no "flat to the plate" part of this die, so you will need support material. I printed it at 100% infill so it would have just a bit more weight and I could sand it smooth. I also included the .blend file in case anyone wants to modify it in Blender.

I made this so our DM can have us roll something when we're about to do something monumentally stupid that will absolutely fail, no question. "*sigh* Fine, roll a D1."