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Parts list for "CNC Dual-Arm Plotter Version 2"
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1 only 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 only Arduino UNO R3 microcontroller
https://www.aliexpress.com/item/high-quality-UNO-R3-ATMEGA16U2-for-Arduino-UNO-R3-NO-USB-CABLE-1pcs/

1 only 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 only stepper motors
Nema17 for 12VDC 2800g.cm 34mm length 4-Lead 17HS3430 17 motor Stepper Motor for CNC

2 only Big EasyDriver modules
2A phase 3D Printer Big Easy Driver board v1.2 A4988 stepper motor driver board

2 only POWGE 80 Teeth GT2 Timing Pulley Bore 5mm for width 6mm

2 only GT2 20 tooth Timing Pulley Aluminum 3D Printer Parts 2GT 20teeth Bore 5mm Width 6mm 

2 only GT2 Closed Loop Timing Belt Rubber 2GT 6mm

10PCS For Openbuilds collar locker OX CNC machine parts Shaft Lock Collar 6mm 

1 only 20mm x 3mm x 1mtr flat aluminium bar.

1 only 20mm x 1mm x 1mtr flat aluminium bar

2 only 3/16 inch (4.76mm) tubluar spacers

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

assorted nuts and bolts: 3mm, 4mm, 6mm (lengths to suit)

assorted drills: 3mm, 4mm, 6mm, 3/16"

rat-tail file

hook-up wire

cable-ties

sticky tape (for attaching pen holder to arm)

Pen holder as described in https://www.instructables.com/id/CNC-Dual-Arm-Plotter/