BOM

This is the bill of material.

Electronics

• Arduino
• Shield with 2 stepper drivers
• 2 x Pololu stepper driver, Pololu
• Standard sized servo

Electronics for the stepper driver shield

• 2 * 4 Screw terminals, 3.5mm, like Reichelt or like this digikey
• Stackable header, like Watterott
• 2 * Pololu stepper driver, like Watterott
• 2 * 18 pin socket, like Reichelt
• Jumper, like Reichelt
• Header, 1x2, 2.54mm, like Reichelt
• Power jack, 2.1mm inner diameter, like Reichelt
• 10k resistor
• optional: 3 * 5mm LEDs, red, green, blue (for debugging and blinking) with current limiting resistors (470-680 Ohm)

Hardware

• Lasercut pieces (5mm MDF), cut your own at Ponoko with this design
• 2 x Suction cups, esska
• 2 x NEMA 17 Stepper Motors, (e.g. Pololu)
• 2 x toothed pulleys, e.g. T2.5, 6mm width, [Mädler] (http://www.maedler.de/Product/1643/1616/986/987.aspx?result=16052200)
• 6m toothed belt, e.g. T2.5, 6mm width, Mädler
• 4 x M5x16
• 2 x M5x35
• 2 x M5 nuts
• 40 x M5 washers (small)
• 4 x M5 washers (big, 20mm), used as guidance for the ball bearings
• 12 x M3x16
• 33 x M3 nuts
• 48 x M3 washers
• 11 x M3x40, must be threaded from top to bottom
• 2 x M10x35, for the counterweight
• 6 x M10 nuts, for the counterweight
• 2 x ball bearings 625zz