Do I need Wi-Fi or is USB/Bluetooth fine?

USB is the most reliable connection and what most seller-subreddit commenters recommend for high-volume work. Bluetooth is convenient if you ship from your phone via the Etsy or eBay apps, and Wi-Fi (as on the Rollo Wireless) is best if you want to print from multiple devices including iPad and Mac without dongles. Reviewers consistently warn that Bluetooth can be glitchier than wired.