This tool can clamp your allen keys to your desk, along with two small wrenches. The design uses the allen key holders of this post: https://www.printables.com/model/320474-allen-key-handle . This design fits the allen keys and wrenches that are delivered with the ender 3.

Printed at 0.2 layer height with supports (for the top clamp part). PLA works fine.

Feel free to remix or recommend changes.