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

CNC Shield Expansion Board+4x A4988 Stepper Motor Driver 1 × 172SAR
ATmega328 Mircocontroller 1 × 29SARSubtotal: 201SAR
CNC Shield Expansion Board+4x A4988 Stepper Motor Driver 1 × 172SAR
ATmega328 Mircocontroller 1 × 29SARSubtotal: 201SAR
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