Raspberry Pad 7 Touch Screen Display and Pi Adapter 7-inch PAD7 (BTT)

The instructions that they give you for this device requires that you either install it from the start or you have to backup and restore your current configurations to use it.

That being said, I've found that if you can ssh into the device and then modify the klipperscreen moonraker host settings to point to the IP address of your current printer (https://klipperscreen.readthedocs.io/en/latest/Configuration/#main-options), you can connect to your printer over wifi and remotely control it. No need to rip stuff out, reprogram anything, or run a long usb cable from the printer motherboard to this device.

Why would you want to do this? I'm not sure. I thought it was convenient having a touchscreen interface for printer control set up a couple feet away from the printer. I could use a phone, but having a dedicated kiosk in the printer room made my life easier. I mean, compared to leaving the room to find the phone and then opening a browser and navigating to the mainsail web gui. A tad pricey, sure. But the screen is crisp and it's responsive to the touch.

Anyway, it's also an underpowered SBC, so if you don't want to use it to run klipper and control your printer, I suppose you can use it for other linux things, like a NAS controller. Screen and wifi included, but you need to provide the keyboard and mouse.

As a sidenote, the wifi signal might be weak. If you don't plan to use this tablet right next to the router, you might need to take the case apart and pull the antenna out from inside so that its signal is not being attenuated by the giant metal heatsink. Me? I disconnected the original antenna, left it right where it was, and plugged in another one that I had lying around. Saved me several disassembly and reassembly steps. IPEX connector.