MiniDraw
thingiverse
This device is a basic form of a polar plotter. To get started, take a look at the Arduino example file "Servoknob" and install two potentiometers with a resistance range of 5-10K ohms. The pcb has been designed to accommodate this extension. Make sure you have an external power supply that provides 5 volts. Note that the Arduino's built-in 5-volt power supply is not capable of powering two servo motors. It's great fun for kids to try drawing simple shapes with the two potentiometers. This example uses an Arduino Nano, but any other Arduino board can be used instead. Check out this video tutorial: https://youtu.be/5O2jQfh01pE
With this file you will be able to print MiniDraw with your 3D printer. Click on the button and save the file on your computer to work, edit or customize your design. You can also find more 3D designs for printers on MiniDraw.