Contrib Cal: A Physical Contribution Calendar

I'm in the final stretch of getting the Contrib Cal ready to ship. It's less about new features and more about making sure everything is solid and easy to use. Here's what I've been working on:

Under the Hood:
*   Refactored the code to be cleaner and less messy.
*   Wrote a bunch of new tests to try and break it. It's now a lot more bulletproof.

Hardware Tweaks:
*   Got a new PEI build plate. The print quality is now super smooth and consistent.
*   Upgraded the screen material to a much thicker, nicer paper. It feels premium and diffuses the light better.
*   Updated the case design to finally have a proper mount for the buck converter (no more loose parts rattling around).
*   Made the recess for the screen a bit deeper so it sits flush.

For the User:
*   Made a laser-cut stencil so users can easily cut a perfect screen shape every time.
*   Updated the Instructables guide with all the new changes and better instructions.

It's all coming together. Almost time to ship these things out.

Interested? Take a look at the product website!

Check out the code and build details on the GitHub repo.