D20 Dice Holder with Magnet Closure

I am always amazed at what can succeed selling on eBay or Amazon, but even more amazed at what fails. This model failed to sell even one piece on eBay at a very conservative price. Everyone I have met at my local gaming stores who holds one in their hands and opens it with a twist wants one immediately. Rather than teasing myself with the idea that I just can't figure out the marketing, I'm making this model available for Free here on thingiverse. The only things you will need apart from this file is a $3 set of rare earth magnets from Harbor Freight (the slots are sized to those magnets) and a small tube of super glue.

ProTip 1: if you are clever, you will realize that this D20 is actually set up correctly and all opposite sides add up to 21. To align the top and the bottom for this to be true when the die is closed, find the "20" and set it up above the "8".

ProTip 2: as you lay in the magnets, make sure you are lining up the poles so that they actually attract to close. If you aren't careful, you will set up the agents and they will not lock to close but repel and never close.

Best Wishes!