Improved Allen Wrench / Hex Key Holder

Allen wrench holder with some improvements:

1. Will not wear out, holds hex keys in with an o-ring, not tension in the plastic
2. All Allen wrenches equally accessible
3. 3D printable
4. Uses a standard o-ring available at most any hardware stores

Why did I make this? Don't allen wrenches come with a holder?

This design resolves two main issues I have with common holders:

1. Typical holders consist of a brick of plastic with interference fit holes for the allen wrenches. Over time, the holes wear out or the plastic just cracks and the wrenches fall out.
2. Typical holders nest all of the allen wrenches one on top of the other. This makes the set lay flat at the cost of being able to quickly get to the smaller allen wrenches. I don't like this tradeoff and would rather they all just be accessible.

I saw Tom Lipton using this style holder on his Ox Tools Youtube channel. It looks like his uses an extension spring in a ring instead of the o-ring. This is a custom thing I believe, so I went with an o-ring instead.