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Rafael Fuentes, Carmen Mara Fuentes and Carmen Prez decided to create this project that was submitted to ‘Creative Electronics’, a Beng Electronics Engineering module at University of Mlaga, School of Telecommunications. The project consists of making an eggbot using an Arduino Uno development board.
This project was done for being a good introduction to CNC machines because you can clearly see and learn all the firmware and hardware concepts that involves them in a fun way. It was also decided to build the main frame from acrylic sheets in order to get our hands dirty in terms of the physical build.
The eggbot is a friendly art robot that can draw on spherical or egg-shaped objects. Your barebone version only needs two stepper motors, a micro servo motor to lift the pen, a bearing and some threaded rod. And of course, youre going to need the electronic bits to drive it all.
Conceptually, one stepper rotates the egg around its axis of symmetry, the other rotates the pens axis so that it can travel north-south, and the servo lifts up the pen between strokes.

Mechanical components:

Lead Screw 8 mm x 150 mm (1x)
KLF08 bearing (1x)
M3 screws
M3 nuts
Electronic components:

CNC shield (1x)
Arduino Uno (1x)
A4988 Stepper Driver (2x)
Nema 17 Stepper Motor (2x)
SG90 Micro Servo (1x)
Jumpers (6)
12V 2A Power Supply (1x)
Male to Female Jumper Wires (3x)”

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