Is this the quick cart or another platform? According to support there is not a way. Though I have not used it in this context you may be able to trigger an action using Zapier or IFTTT (IF This Then That) to connect to a label printing service.
The quick cart has some great features, but it is an introductory cart. If you need a lot of automation, a wordpress-based cart, Shopify, etc. may be a better solution. With the quick cart there is more manual intervention in the order handling and the data management aspect than with other platforms.