WiFi SD Card
Without using any extra components or wifi adapters - you can get this Toshiba FlashAir SD card with WiFi built in for about $20. This is useful for controlling printers remotely, without adding another microprocessor such as a Raspberry Pi.
Links
OSE Collaboration
- MJ contacted author via Instructables on getting code for using a single laptop to run multiple printers on 5/31/19