Ender 3 Tool Holder Extended

NB! Because this design relies on tight fit tolerances, please be sure to [calibrate your printer](https://old.reddit.com/r/ender3/comments/ec2i9j/how_to_calibrate_your_printers_esteps_and/) before attempting! Otherwise there's a good chance tools may not fit properly.

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UPDATE 3/23/22: Two versions of the upper and lower drawers (with/without tool holders) are now available. NOTE: The lower drawer will not be tall enough to hold the MicroSD card reader. There just isn't space to make it fit.

UPDATE 3/19/22: Updated the upper drawer with thicker/stronger/reinforced tool stays. Also added FreeCad source file.

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Another remix of the original Ender 3 / Ender 3 Pro behind-the-LCD tool holder! This remix has two main features:

First, the main tool holder drawer has been redesigned for easier access and less vibration while printing:
- Each tool's pegs have been rearranged to better hold tools in place
- Wrenches sit on small shelves to make it easier to pick them u