After the first trivial proof of concept I started working on a proof of concept with bigger dimensions and better electronics. I still didn't use any expensive aluminum hardware as I didn't have a final design for my robot.

Components:

• cheap materials (cardboard and wood)
• 4 NEMA 17 stepper motors
• 4 DRV8825 Stepper Motor Drivers
• timing belts & pulleys (GT2)
• v-wheels
• Teensy 3.5
• Raspberry Pi 2 Model B
• Power Supply 12V 8.5A 102W
• Precision shaft & Lead Screw T8 1000mm
• Cables, resistors, buttons, switches, capacitors and prototyping boards