USB shield – usb host shield
if you will not use External Power please be sure this jumpers are soldered as below :

so after soldering it will be like this image

2N2222 NPN Transistor BJT
1 × 5 SAR
Transistor Kit 17 Value 170pcs
1 × 81 SAR
CNC Shield Expansion Board+4x A4988 Stepper Motor Driver
1 × 172 SAR Subtotal: 258 SAR
2N2222 NPN Transistor BJT
1 × 5 SAR
Transistor Kit 17 Value 170pcs
1 × 81 SAR
CNC Shield Expansion Board+4x A4988 Stepper Motor Driver
1 × 172 SAR Subtotal: 258 SAR
if you will not use External Power please be sure this jumpers are soldered as below :

so after soldering it will be like this image

All Electronics Components
All Electronics Components
All Electronics Components
All Electronics Components
All Electronics Components
All Electronics Components
All Electronics Components
All Electronics Components