As Easyship provides different label printing options that can be selected in the "Settings > Printing Options" section of your dashboard. One of the settings is "Thermal", which will generate shipping documents in a full-page 4x6 format.

After the setting Thermal is selected, you can use iDPRT thermal label printer SP410 or SP420 or other models to print in EasyShip.

Please refer to the below link for the detailed setup instruction:

https://support.easyship.com/hc/en-us/articles/360052736892-What-are-Thermal-Shipping-Labels-