On the Buildbotics website, it says their controller is compatible with a USB webcam to view/monitor the machine through the HTML control page. They sell the Logitech C270 alongside their hardware. I would assume this works with the Onefinity branded controller as well. (does it?). It seems like nobody has mentioned this function yet. I picked one up on eBay for $40.
Here is a list of webcams known to be compatible with the Raspberry Pi hardware: https://elinux.org/RPi_USB_Webcams