Micro-Sketch Post-it Note Remix

This is a remix of the [original Micro-Sketch](https://www.thingiverse.com/thing:1668472) by [Ferjerez](https://www.thingiverse.com/Ferjerez) and the [remix](https://www.thingiverse.com/thing:2696231) by [PowerScissor](https://www.thingiverse.com/PowerScissor). The recognition should go to these fine people as I've only taken what they've created and re-purposed it to my needs.

What is it?
====================
A remix of the popular and awesome Micro Sketch by Ferjerez. Micro Sketch is a 2d pen plotter, similar to an Etch-a-Sketch.

My version uses a paper carriage tray sized to fit 3x3" post-it notes, a friction-fit pen holder, as well as some tweaks to functionality and tolerances.

Why I remixed it
====================
I helped lead an engineering camp for kids and wanted to teach them about rack and pinion gears. Because it was part of a larger activity and without constant adult support, I wanted the micro-sketch to be easy for the kiddos to change both the paper and pe