The plotter cutter page indicates that there’s a raspberry pi to connect to so that you can print over WiFi.
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Browser-based control
Plug the computer end of the USB cable into the Raspberry Pi Zero W taped under the cutter, and ensure that the board is powered and a green light is visible.
Then you can upload an HPGL file from any device connected to the SLMS WiFi by visiting http://slmsvinyl.ddns.net/
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I think this is now incorrect, so direct cable from computer is only way to go via USB.
Has anyone done this recently? Would love to use it for some stuff!