Dremel's easy-to-use DigiLab 3D40 Flex 3D Printer has user-friendly software, good output quality, and a wide mix of connectivity options. It's a fine choice for classroom use.
The 3D40 Flex does add convenience features, though, like a high-speed, low-quality "draft" print mode and a flexible steel build plate that printed objects snap right off of.
Schools looking to get 3D printing into the curriculum for the first time will find this model an easy fit for several reasons. The 3D40 Flex is a snap to set up and use, and it showed good overall print quality with few misprints. Also, it employs user-friendly software based on the same Cura open-source platform that many popular 3D printers use. And it can connect via Ethernet, USB, or Wi-Fi, or by plugging in a USB thumb drive containing the source file to be printed.
The filament being limited to PLA, which is very easy to work with, will be fine for basic education applications