Same experience as domi, had to take the whole thing apart. It was pretty straightforward as the guide was excellent. My only regret is forgetting to enable SSH access before reassembling it.

It’s pretty common for newer 3D printers to have WiFi. Start/stop jobs, monitor cameras, or just to have a more capable UI than the built-in screen. Lots of people add this capability to older printers (or new ones with sucky interfaces) with OctoPrint.

Big +1 for Valetudo. I use it on a refurbished Roborock S7+ I got on eBay and it’s fantastic.

Easy way to avoid this: choose a different port. I think it’s a safe bet the crawlers are just checking 25565. I’ve had a server up for months with zero issues.