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Parts list for "CNC Dual-Arm Plotter"
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1 x adjustable DC power supply (project requires 9 volts @ approx 2 ammps)
https://www.aliexpress.com/item/FREE-SHIPPING-CPS-3205-Compact-Mini-Variable-Adjustable-DC-Power-Supply-0-32V-0-5A-AC110/

1 x Arduino UNO R3 microcontroller
https://www.aliexpress.com/item/high-quality-UNO-R3-ATMEGA16U2-for-Arduino-UNO-R3-NO-USB-CABLE-1pcs/

1 x SG90 servo motor
https://www.aliexpress.com/item/FreeShipping-5pcs-lot-Tower-pro-SG90-RC-Micro-Servo-9g-For-Arduino-Aeromodelismo-Align-Trex-450/

2 x stepper motors
https://www.aliexpress.com/item/free-shipping-17HS2408-4-lead-Nema-17-Stepper-Motor-42-motor-42BYGH-0-6A-CE-ROSH/
2 x "Easydriver" modules

https://www.aliexpress.com/item/5PCS-LOT-EasyDriver-Stepper-Motor-Driver-Module-V44-A3967/

2 x robot wheels with tyres
https://www.aliexpress.com/item/freeshipping-Robot-Wheel-Tire-65mm-RC-Car-Chassis-wheels-tire-tyre-diy-rc-toy-smart-car/

2 x 5mm hex shaft couplers
https://www.aliexpress.com/item/2pcs-5mm-Brass-Hex-Shaft-Coupling-Coupler-RC-Gear-Motor-Connector-Robot-DIY/

4 x 12 inch (300mm) plastic rulers 

1 x mounting  board (approx 400mm x 600mm x 6mm)

assorted nuts and bolts: 3mm, 4mm (lengths to suit)

assorted drills: 3mm, 4mm, 6mm

rat-tail file

hook-up wire

cable-ties

sticky tape (for attaching pen holder to arm)