Polargraph - Parts and Instructions

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I base my work on that of others - I'm simply building upon existing information and models with the modifications that I see fit. I closely followed this tutorial for my entire assembly, making adjustments where necessary - http://www.instructables.com/id/Polargraph-Drawing-Machine/. In addition, I referenced this site for more details and updated software - http://www.polargraph.co.uk/. I am utilizing two NEMA 17 motors from Adafruit. These motors are controlled by an Arduino Uno and a motor shield V1 from Adafruit, which happens to work perfectly with the 'firmware' for my Polargraph machine. A 12-volt power supply of 1.5 amps powers the motor shield, while I have isolated it from the Uno using a removed jumper, allowing it to draw power and information from my PC directly. Two six-foot ball chains with a diameter of three and five tenths millimeters serve as both gears and pulleys in this system - they are functioning exceptionally well for this project. I flashed the latest 'firmware' available at this GitHub link - https://github.com/euphy/polargraphcontroller/releases/latest. The firmware is made up of a set of sketches for the Arduino Uno that require adjustment to accommodate whatever motor shield is being used - V2 has presented some issues according to what I have read, although my experience with it is limited. On the other hand, version 1 is functioning smoothly for me so far. The software is accessible here https://github.com/euphy/polargraphcontroller/releases/tag/1.10.6a. Be sure to read the wiki page associated with this software release - https://github.com/euphy/polargraph-. With a bit of practice and experimentation, I found it fairly easy to get accustomed to the operation. One important thing was to regularly restart my machine, allowing it to run smoother. Another essential point to remember is to properly follow the instructions on calibrating your machine, which can be found in detail at the given Instructable link. This ensured that many potential issues I had with my machine out of the box were effectively resolved.