It has been pointed out to me that Octoprint doesn’t work out the box with the Anycubic Predator. Fortunately for us, Anycubic has been shipping the new trigorilla pro controller board in Mega i3’s since last year. Since then, Foosel has been able to work out whats going on and get this board to work with Octoprint.
To cut a long story short, install https://gist.github.com/foosel/77e4792921db744a157764f66d1d72a5 the add in from here as a plugin in Octoprint and away you go. I can confirm it works as I am printing from Octoprint on windows as we speak.
Unfortunately, this is just another nail in the trigorilla pro’s coffin.
To install the plugin, you need to do it via SSH rather than the web interface.
So log into the machine and issue the following
sudo service octoprint restart
Hope this helps