To give you a [scan-my-local-network-for-my-printer] button!

Your 3D printer is already listening on an unsecure HTTP/Websocket port (usually ws://[...]:81). Modern browsers (usually for good reason) disallow https:// sites from talking to http:// sites. The ws:// protocol is an extension of http://. Ergo, no https:// website will ever be able to talk to a ws:// printer.

Nothing this app does makes your network or printer any less secure than it already is. If you're still concerned, your only recourse is to turn off your printer's WiFi and/or modify the firmware.